The sourcemap implement port from
[rust-sourcemap](https://github.com/getsentry/rust-sourcemap), but has
some different with it.
- Encode sourcemap at parallel, including quote `sourceContent` and
encode token to `vlq` mappings.
- Avoid `Sourcemap` some methods overhead, like `SourceMap::tokens()`
caused extra overhead at common cases. Here using `SourceViewToken` to
instead of it.
- Adds option to `CodegenOptions` - `enable_typescript` to enable output
of TS.
- Stops skipping output that is TS when `enable_typescript` is enabled
- Adds TS support to
- Function
- FormalParameter
- BindingPattern
- Adds basic tests for TS generation
---------
Co-authored-by: Boshen <boshenc@gmail.com>
