add github action to update doc

[yen-tt]

add a github action to automate a commit for updating docs if it's out of date. The action will run api extractor in local mode to build api report file, and the logLevel is updated to 'error' so api extractor will fail in local mode and action will exit with non-zero code

also update build command to remove lib folder before running tsc and api extractor to ensure there's no old files in lib that may generate errors in local build.

J=SLAP-1902
TEST=auto

made a small change to a file's doc and push to pr. see that a commit is made from github action to update docs.

updated build command to delete lib before creating build and running api extractor

[oshi97]

I've sometimes seen typescript not remove files it should (or that I think it should, anyway), like when I removed components/Filters.tsx, and added the components/Filters folder - imports for components/Filters would point to Filters.tsx instead of Filters/index.tsx. But I've also seen it work as I expect, where it removes the stale files. Do we kind of know why this sometimes happens (or maybe it always happens and I misremembered) and do we need it in all our typescript libs?

[yen-tt]

From my understanding, typescript compiler does not clean or delete files from its outDir folder. It just overwrite files if there's an update but the old ones stay. This was causing problem for me locally with api extractor picking up errors from old generated build files. Looking at these issues (microsoft/TypeScript#13722, microsoft/TypeScript#16057), doesn't look like there's a native solution other than adding some watch functionality or manual clean command.