Add initial implementation of auth service · Kuadrant/wasm-shim@f2dc5a4

The following actions uses node12 which is deprecated and will be forced to run on node16: 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-rs/toolchain@v1, arduino/setup-protoc@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/

unused imports: `CheckResponse_oneof_http_response` and `CheckResponse`

function `get_attribute` is never used

associated functions `new`, `message`, `build_check_req`, `build_request`, and `build_peer` are never used

`wasm-shim` (lib) generated 3 warnings (run `cargo fix --lib -p wasm-shim` to apply 1 suggestion)

unused imports: `CheckResponse_oneof_http_response` and `CheckResponse`

function `get_attribute` is never used

associated functions `new`, `message`, `build_check_req`, `build_request`, and `build_peer` are never used

`wasm-shim` (lib test) generated 3 warnings (run `cargo fix --lib -p wasm-shim --tests` to apply 1 suggestion)

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