Migrate contribs client to main client

[esoteric-ephemera]

See MPContribs #1982 for more details about client reorganization.

Pulls mpcontribs-client into mp_api as an optional add-on. Changes include:

• Reorganize client into modules for easier editing
• Replace some quasi-deprecated packages in favor of those already in the stack (e.g., ujson in favor of orjson)
• Align the syntaxes of the main API client and the MPC client (i.e., consistent naming of class kwargs)
• dynamically constructed pydantic models for returned data types in contribs

[codecov-commenter]

Codecov Report

❌ Patch coverage is 53.67603% with 775 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.55%. Comparing base (c2147cf) to head (8c0646a).

Files with missing lines	Patch %	Lines
mp_api/client/contribs/client.py	37.76%	692 Missing ⚠️
mp_api/client/contribs/_types.py	74.70%	43 Missing ⚠️
mp_api/client/contribs/utils.py	70.68%	17 Missing ⚠️
mp_api/client/contribs/schemas.py	92.15%	12 Missing ⚠️
mp_api/client/contribs/_logger.py	85.71%	6 Missing ⚠️
mp_api/client/contribs/settings.py	91.48%	4 Missing ⚠️
mp_api/client/core/schemas.py	98.57%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (c2147cf) and HEAD (8c0646a). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (c2147cf)	HEAD (8c0646a)
	3	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1075       +/-   ##
===========================================
- Coverage   86.70%   73.55%   -13.15%     
===========================================
  Files          47       56        +9     
  Lines        2632     4239     +1607     
===========================================
+ Hits         2282     3118      +836     
- Misses        350     1121      +771     

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