Support Josverl/micropython-stubber as stubs repository + Stubs module renovations.

[BradenM]

Entry to cleaning up the current messy state that is the stubs module.

The stubs module is currently very dependent on the schema used in micropy-stubs. This is an issue for several reasons, but the biggest one being that it just isn't necessary and introduces many limitations.

This PR focuses primarily on how micropy locates and sources stubs that are not local to the machine (i.e, remote repositories of stubs).

Micropy can now source stubs from either micropy-stubs or https://github.com/Josverl/micropython-stubs and is set up to be easily extendable to enable support for any future formats / methods of stub retrieval that may arise.

Next will be improving how micropy finds and treats stubs that are local to the machine. (In a seperate PR, since the scope of this one already expanded way too much 😉 )

[BradenM]

@Josverl

I am thinking of targeting https://github.com/Josverl/micropython-stubs/blob/main/publish/package_data.jsondb to source pypi package names (to ensure I lookup the correct package, for security and such).

Is this output stable? Lemme know what you think.

[Josverl]

Likely I'll add one or two attributes and might change the primary key to support upsets before

[codecov]

Codecov Report

Base: 94.93% // Head: 93.50% // Decreases project coverage by -1.42% ⚠️

Coverage data is based on head (9aa583e) compared to base (9c723df).
Patch coverage: 85.25% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #304      +/-   ##
==========================================
- Coverage   94.93%   93.50%   -1.43%     
==========================================
  Files          37       48      +11     
  Lines        2311     2619     +308     
==========================================
+ Hits         2194     2449     +255     
- Misses        117      170      +53     

Flag	Coverage Δ
unittests	93.50% <85.25%> (-1.43%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
micropy/stubs/stubs.py	91.97% <61.53%> (-6.43%)	⬇️
micropy/stubs/repo_package.py	70.73% <70.73%> (ø)
micropy/stubs/repositories/micropython.py	77.41% <77.41%> (ø)
micropy/stubs/repositories/micropy.py	84.61% <84.61%> (ø)
micropy/cli.py	95.26% <87.50%> (-1.41%)	⬇️
micropy/stubs/repo.py	89.70% <89.70%> (ø)
micropy/stubs/package.py	92.30% <92.30%> (ø)
micropy/stubs/manifest.py	94.73% <94.73%> (ø)
micropy/main.py	97.70% <100.00%> (ø)
micropy/stubs/__init__.py	100.00% <100.00%> (ø)
... and 11 more

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