It seems that meson only supports emscripten as a compiler to wasm at present, wasi-sdk support is not completed yet, so this only adds ci build scripts for emscripten.
References:
* <f41bdae368>
* <https://github.com/mesonbuild/meson/pull/11862>
* tests: new built-in test runner
* tests: update tests for new builtin test api
* tests: print test suite logs
* tests: remove cmocka from build files
* tests: colorize test suite log and remove redundant prints