refactor(llc): improve openapi generation

[renefloor]

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Closes FLU-222

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• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

This heavily simplifies code generation and allows for token refresh using Dio.

All base dio classes are now added/moved to GetStream/stream-core-flutter#4
Code generation is done by https://github.com/GetStream/chat/pull/9505

Note that all DateTime values are annotated with @EpochDateTimeConverter, as they are send with nanosecond format in v2 api's.

Screenshots / Videos

Before	After
img	img

[codecov]

Codecov Report

❌ Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.19%. Comparing base (40d77aa) to head (1c77f26).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/stream_feeds/lib/src/feeds_client.dart	84.21%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              main       #5       +/-   ##
============================================
- Coverage   100.00%   62.19%   -37.81%     
============================================
  Files            1       17       +16     
  Lines            1      291      +290     
============================================
+ Hits             1      181      +180     
- Misses           0      110      +110     

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