fix(solc): prefere dapptools style remappings

[mattsse]

Motivation

Fix an edge in remapping resolution that made it nondeterministic for layouts like:

ds-test
├── demo
│   └── demo.sol
└── src
    └── test.sol

Solution

favor dapptools style lib paths ("lib"/"src") over others ("demo") with additional check

[ethers-solc/src/remappings.rs:463] Remapping::find_many("git/rust/foundry/integration-tests/testdata/guni-lev/lib") = [
    Remapping {
        name: "ds-test/",
        path: "git/rust/foundry/integration-tests/testdata/guni-lev/lib/ds-test/src/",
    },
]

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog

[gakonst]

This PR broke remappings, resulting in the internal libs to be unbundled in their packages. Example from Vaults using Solmate

➜  vaults git:(main) ../foundry/target/debug/forge  remappings
tokens/=/Users/gakonst/oss/vaults/lib/solmate/src/tokens/
auth/=/Users/gakonst/oss/vaults/lib/solmate/src/auth/
weird-erc20/=/Users/gakonst/oss/vaults/lib/solmate/lib/weird-erc20/src/
users/=/Users/gakonst/oss/vaults/lib/solmate/src/test/utils/users/
authorities/=/Users/gakonst/oss/vaults/lib/solmate/src/auth/authorities/
utils/=/Users/gakonst/oss/vaults/lib/solmate/src/test/utils/
ds-test/=/Users/gakonst/oss/vaults/lib/solmate/lib/ds-test/src/
demo/=/Users/gakonst/oss/vaults/lib/solmate/lib/ds-test/demo/
test/=/Users/gakonst/oss/vaults/lib/solmate/src/test/
mocks/=/Users/gakonst/oss/vaults/lib/solmate/src/test/utils/mocks/

it unbundled the solmate dep into all its sub-parts