Make use of github actions for CI and release [$1080]

[mainnet-pat]

monero-ts can benefit from GH Actions for CI, running tests on new commits in branches and PRs, detect changes to C++ code and rebuild emscription. Also package the release to be deployed on NPM upon new release action.

This approach will make use of docker environment for reproducible builds and for running the monerod and monero-wallet-cli in tests.

See how we did it in mainnet-cash/mainnet-js

[github-actions]

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[mainnet-pat]

I will work on this