feat: support ci on actions.

[richardo2016]

This PR add support to CI based on github actions. Once new commits pushed to specified branchs(e.g, main), or any PR created to original repository's main branch, actions would be triggered to do those check on ALL OS (windows/macOS/Linux):

• if compilation to WASM valid
• if lexer (wasm version) valid
• if compilation to ASM.js valid
• if lexer (asm.js version) valid
• benchmark

You can see process of actions here, I have tested it several times @guybedford

[guybedford]

Thanks for the PR, definitely much needed and the setup is great.

Since we don't yet have automated builds for asm.js it may be better to separate that one out for now / comment it out and just focus on supporting the Wasm tests and benchmarks at least.

[guybedford]

Let's try it out!