Add rustls library and fix free identifier error message · mattwparas/steel@e952c1f

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/

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

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/

field `0` is never read

`steel-websockets` (lib) generated 1 warning

struct `BlockingResponse` is never constructed

field `0` is never read

`steel-webrequests` (lib) generated 2 warnings

unused imports: `CustomType`, `FFIArg`, `FFIValue`, `FromFFIArg`, `HostRuntimeFunction`, `IntoFFIVal`, and `as_underlying_ffi_type`

unused import: `stdout`

unused import: `ClientConnection`

unused import: `Write`

unused import: `Read`

field `0` is never read

`steel-rustls` (lib) generated 6 warnings (run `cargo fix --lib -p steel-rustls` to apply 3 suggestions)

struct `AsyncResponse` is never constructed

struct `BlockingResponse` is never constructed

field `0` is never read

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