feat(cli): Add callbacks to cli

[lake2]

Closes https://github.com/swc-project/pkgs/issues/55

I rename packages/cli/src/swc/index.ts to packages/cli/src/swc/bin.ts, and export swcDir function via new packages/cli/src/swc/index.ts

add doc here: https://github.com/swc-project/website/pull/261

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[lake2]

Can you add some tests for this?

I tried, I can add tests for watch=false and sync=true options. It's hard to mock worker and file change watcher.

[kdy1]

I think tests to ensure that onSuccess and onFail are called are enough

[lake2]

I think tests to ensure that onSuccess and onFail are called are enough

Sure. I will accomplish it later.

[lake2]

I think tests to ensure that onSuccess and onFail are called are enough

Test cases update. Can you release a beta version for testing?