Fix implied formats, file watching, new source file creating during edits - #50098

This change includes:

1. When program is created, we track package.json per file that affect its implied format
2. We watch those files to invalidate resolutions of that file
3. If oldSourceFile.impliedNodeFormat is not same as new one, we need to create new file, so we pass that information to host
4. Document registry handles implied node format as part of its key to get the file and release it
5. Package.json files are being watched so we know when to clear the package json info cache.
6. Fixed issue with module resolution cache not passed around in watch mode
7. If implied file format is determined by package.json persence/absence and file is module, its reported with --explainFiles

Fixes #50086