refactor: ⚡ performance upgrade - complete rewriting

[ixunio]

Complete revamp of internal code for JWT/JWS/Validation, with mostly no breaking changes. Dramatic speed up for encoding and decoding operations with or without validation running.

• 🎨 JWT and JWS classes have been removed in favor of pure functional paradigm
  • ⚡ encode() / decode() are now written in jwt.py as pure functions, same for jws encode and decode functions.
  • 🔥 JWT, JWS, JWSTokenLifeCycle removed
• ➕ cryptography is now used by default for all algorithms and is a mandatory requirement. HMAC now uses cryptography instead of hmac
• ⚡ default generated headers does not run validation
• ⚡ during encoding, claims JSON payload is directly created from Pydantic .model_dump_json()
• ⚡ Removed default config logic: ValidationConfig is now a simple Python class with no mutability issues. Removed the deep copy from previous logic
• ⚰️ removed NoneAlgorithm and NoneKey
• ✨ set_max_token_bytes() to update the max token bytes size allowed during encoding/decoding operation. Replaces previous low level JWT init parameter.
• ⚡ cache algorithm instances
• ⚰️ removed the incomplete 'b64' header validation logic, this is not a supported feature
• ✅ 100% coverage in tests

[codecov]

Codecov Report

❌ Patch coverage is 99.02597% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.49%. Comparing base (ed45872) to head (dece810).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
superjwt/validations.py	97.64%	0 Missing and 2 partials ⚠️
superjwt/shared.py	98.18%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   97.97%   99.49%   +1.51%     
==========================================
  Files           9       10       +1     
  Lines        1089      993      -96     
  Branches      132      118      -14     
==========================================
- Hits         1067      988      -79     
+ Misses         19        0      -19     
- Partials        3        5       +2     

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