fix: environment cache invalidation

[ArgonAlex]

Previously, the setupCache function always returned undefined, so it seems that cache invalidation based on the environment has never worked.

This fixes that bug, and also add and removes some parameters for the cacheIdentifier.

Removes:

• awesome-typescript-loader-query - because this is already included in the cache key elsewhere (https://github.com/s-panferov/awesome-typescript-loader/blob/master/src/cache.ts#L70)

Adds:

• compilerConfig - the typescript compiler configuration
• babelPkg - babel config in package.json
• env - process environment variables that babel can potentially use

We should also look up the directory tree for babelrc.js/babelrc.json files, but I think this is at least good start for now.

[s-panferov]

Amazing, thanks! I'll look through it at the weekend.