chore: add implicit BorshSchema derive for store::UnorderedMap

[dj8yfo]

checked against test_unord_map_contract

• Building contract
 │    Compiling test_contract v0.1.0 (/home/user/Documents/code/test_contract)
 │ warning: unused import: `log`
 │  --> src/lib.rs:1:16
 │   |
 │ 1 | use near_sdk::{log, near};
 │   |                ^^^
 │   |
 │   = note: `#[warn(unused_imports)]` on by default
 │
 │ warning: use of deprecated struct `near_sdk::store::UnorderedMap`: Suboptimal iteration performance. See performance considerations doc for details.
 │  --> src/lib.rs:5:33
 │   |
 │ 5 |     greetings: near_sdk::store::UnorderedMap<String, String>,
 │   |                                 ^^^^^^^^^^^^
 │   |
 │   = note: `#[warn(deprecated)]` on by default
 │
 │ warning: use of deprecated struct `near_sdk::store::UnorderedMap`: Suboptimal iteration performance. See performance considerations doc for details.
 │   --> src/lib.rs:11:41
 │    |
 │ 11 |             greetings: near_sdk::store::UnorderedMap::new(b"g"),
 │    |                                         ^^^^^^^^^^^^
 │
 │ warning: `test_contract` (lib) generated 3 warnings (run `cargo fix --lib -p test_contract` to apply 1 suggestion)
 │     Finished `release` profile [optimized] target(s) in 0.31s
✓ Contract successfully built! (in CARGO_NEAR_BUILD_ENVIRONMENT=host)

[dj8yfo]

this line wasn't proxying
from {}__NEAR_SCHEMA_PROXY to the BorshSchema::declaration() of type being derived, but replacing with its own implementation instead.

the change of schema of UnorderedMap<NoSchemaStruct, NoSchemaStruct> in added test
due to change in the mentioned line is from

before

{
    "()": Primitive(
        0,
    ),
    "FreeList": Struct {
        fields: NamedFields(
            [
                (
                    "first_free",
                    "Option<FreeListIndex>",
                ),
                (
                    "occupied_count",
                    "u32",
                ),
                (
                    "elements",
                    "Vector < T >",
                ),
            ],
        ),
    },
    "FreeListIndex": Struct {
        fields: UnnamedFields(
            [
                "u32",
            ],
        ),
    },
    "IndexMap": Struct {
        fields: NamedFields(
            [
                (
                    "prefix",
                    "Vec<u8>",
                ),
            ],
        ),
    },
    "LookupMap": Struct {
        fields: NamedFields(
            [
                (
                    "prefix",
                    "Vec<u8>",
                ),
            ],
        ),
    },
    "Option<FreeListIndex>": Enum {
        tag_width: 1,
        variants: [
            (
                0,
                "None",
                "()",
            ),
            (
                1,
                "Some",
                "FreeListIndex",
            ),
        ],
    },
    "UnorderedMap": Struct {
        fields: NamedFields(
            [
                (
                    "keys",
                    "FreeList < T >",
                ),
                (
                    "values",
                    "LookupMap",
                ),
            ],
        ),
    },
    "Vec<u8>": Sequence {
        length_width: 4,
        length_range: 0..=4294967295,
        elements: "u8",
    },
    "Vector": Struct {
        fields: NamedFields(
            [
                (
                    "len",
                    "u32",
                ),
                (
                    "values",
                    "IndexMap",
                ),
            ],
        ),
    },
    "u32": Primitive(
        4,
    ),
    "u8": Primitive(
        1,
    ),
}

to

after

{
    "()": Primitive(
        0,
    ),
    "FreeList": Struct {
        fields: NamedFields(
            [
                (
                    "first_free",
                    "Option<FreeListIndex>",
                ),
                (
                    "occupied_count",
                    "u32",
                ),
                (
                    "elements",
                    "Vector",
                ),
            ],
        ),
    },
    "FreeListIndex": Struct {
        fields: UnnamedFields(
            [
                "u32",
            ],
        ),
    },
    "IndexMap": Struct {
        fields: NamedFields(
            [
                (
                    "prefix",
                    "Vec<u8>",
                ),
            ],
        ),
    },
    "LookupMap": Struct {
        fields: NamedFields(
            [
                (
                    "prefix",
                    "Vec<u8>",
                ),
            ],
        ),
    },
    "Option<FreeListIndex>": Enum {
        tag_width: 1,
        variants: [
            (
                0,
                "None",
                "()",
            ),
            (
                1,
                "Some",
                "FreeListIndex",
            ),
        ],
    },
    "UnorderedMap": Struct {
        fields: NamedFields(
            [
                (
                    "keys",
                    "FreeList",
                ),
                (
                    "values",
                    "LookupMap",
                ),
            ],
        ),
    },
    "Vec<u8>": Sequence {
        length_width: 4,
        length_range: 0..=4294967295,
        elements: "u8",
    },
    "Vector": Struct {
        fields: NamedFields(
            [
                (
                    "len",
                    "u32",
                ),
                (
                    "values",
                    "IndexMap",
                ),
            ],
        ),
    },
    "u32": Primitive(
        4,
    ),
    "u8": Primitive(
        1,
    ),
}

[dj8yfo]

this test

is still around in https://github.com/near/near-sdk-rs/actions/runs/9700288636/job/26771329531

[dj8yfo]

newly added test can be found in https://github.com/near/near-sdk-rs/actions/runs/9700288636/job/26771331115 too