Improve watcher code

[DZakh]

1. Moved the code responsible for getting gentypeconfig to the place where it's actually needed. So we don't run unneeded code for other scripts
2. Stopped calling fs.existsSync(bsConfigFile) for getting gentypeconfig. It's redundant
3. Fixed watcher being triggered multiple times on .gen.tsx change when the generatedFileExtension option is omitted (the default value is used). I've broken it in the 7e2e81f
4. Better data structures and algorithms for a little performance gain
5. Redesigned rebuild scheduling logic. Now it's more bulletproof with a debounce which cancels incoming rebuilds
6. Started reinitializing dir watchers only on a rebuild after the bsconfig.json change. Before it reinitialized them on every rebuild
7. Started logging the releaseBuild error in verbose mode
8. Moved console.clear right before the actual build. Don't clear the console in cases when a lock file is not acquirable
9. Started failing if can't acquire the .bsb.lock file after 4 retries. It could go into an infinite loop before.

[DZakh]

It's not ready for review. I think there might be an issue

[DZakh]

Let's wait for rewatch 😊