Adds read-write API generation support for Java code generation · amazon-ion/ion-cli@f335349

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Cargo Test: tests/code-gen-tests.rs#L1

unused import: `anyhow::Result`

Cargo Test: tests/code-gen-tests.rs#L2

unused import: `std::io::Write`

Cargo Test: tests/cli.rs#L5

unused import: `std::fs`

`ion-cli` (test "code-gen-tests") generated 2 warnings (run `cargo fix --test "code-gen-tests"` to apply 2 suggestions)

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

associated items `new` and `d` are never used

associated items `new`, `b`, `a`, and `c` are never used

associated items `new` and `value` are never used

associated items `new`, `b`, `d`, `a`, and `c` are never used

`code-gen-demo` (lib test) generated 4 warnings

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