Load sets data and tune collections (for a certain tune) data from The Session web API

[zmoon]

Initial version. May later change the data structure of the returns (e.g. to include more info).

Towards #66 but doesn't implement everything discussed there (tags, etc.)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.26%. Comparing base (86c23ad) to head (6b5c1f3).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   94.07%   94.26%   +0.19%     
==========================================
  Files          15       15              
  Lines        1687     1745      +58     
==========================================
+ Hits         1587     1645      +58     
  Misses        100      100              

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[Copilot]

Pull request overview

This PR adds functionality to load sets data and tune collections data from The Session web API. The changes enable fetching information about which collections contain a specific tune, retrieving individual member sets, and fetching all sets for a member with pagination support and multi-threading capabilities.

Changes:

• Added a generic _consume function to handle paginated API endpoints with configurable multi-threading
• Added get_tune_collections to retrieve collection information for a specific tune
• Added get_member_set and get_member_sets to retrieve member set data with pagination support
• Added comprehensive test coverage for the new API functions

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 10 comments.

File	Description
pyabc2/sources/the_session.py	Implements core API consumption logic with _consume and three new public functions for retrieving tune collections and member sets data
tests/test_sources.py	Adds six new test functions covering the new API functions, including validation tests and pagination scenarios

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