Allow fileDescriptions to be injected in plugins. File descriptions allow plugins to act on the file names discovered in the project under test (excluding any ignored files).

A FileDescriptions object contains file names as keys and a new FileDescription as a value. A file description currently only houses a mutate property (of type MutationDescription).

class MyChecker {
  static inject = [commonTokens.fileDescriptions] as const;
  constructor(fileDescriptions: FileDescriptions) { }
}

Also did some housekeeping.

• Previously, StrykerJS would load all project files (excluding ignored files, like node_modules) into memory. This is now no longer the case, only the files being mutated (or otherwise needed) are loaded, and the rest are copied (using fs.promises.copyFile) to the sandbox. This is both a small performance improvement as well as a big memory improvement.\
• Replaced the InputFileResolver and InputFileCollection with ProjectReader and Project abstractions. Also added a ProjectFile, responsible for keeping the in-memory state of a file.
• Removed some unused interfaces from the @stryker-mutator/util
• Slightly changed the API for @stryker-mutator/instrumenter. This is technically a breaking change, but since this package is not meant for public consumption this is not needed for a major version bump.
• FIxed a small unrelated bug: Stryker instrumenter disable type checking doesn't insert @ts-nocheck after the jest env for subsequent files #3583

This PR is needed to finish #3474
Fixes #3583