Simplify / speed-up / enhance node package manager implementations

[fviernau]

ORT has the node package managers Npm, Pnpm, Yarn, Yarn2, whereas Pnpm and Yarn inherit from Npm.
Changing the code in Npm has turned out to be quite hard / complicated. One of the complications is, that
it is not easily possible to make a change which applies only to one of these 3 managers. In fact, most code changes need
to work with all 3 managers.

Furthermore, there is code redundancy between Yarn2 and Npm, and also code in Npm which is only used by one of the child classes. All in all, a bunch of stuff to clean-up.

This will be approached in the following steps:

1. Remove the inheritance between the package managers
2. Potentially re-write parts of each of the managers to rely on the command output rather than
   on the node_modules file structure.
3. Clean-up as much code as possible in the now separated package managers
4. Remove code redundancies across the managers (also covering Yarn2), most importantly:
   • Logic for model mapping (PackageJson -> Package / Project)
   • Requesting remote package details
5. Improve performance of these requests by parallel execution. (Maybe also by using yarn2, if installed, as it supports batch requests)
6. Add support for NPM workspaces, or any other missing features discovered during previous steps.