Next Python SDK major

[sentrivana]

We're preparing our next major on this branch.

The project is tracked in Linear. If you don't have access, we'll try to tag issues belonging to the project with the SDK 3.0 label on GitHub so that you can follow along.

Context

You might have read this announcement about us discontinuing work on a 3.0. This is referring to the work done on the potel-base branch, which included two types of changes: a huge refactor of our tracing code on the one hand, and various unrelated changes, improvements and fixes on the other. We're dropping the huge refactor part, and only porting the rest, to a new branch and eventually a new 3.0 release.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.95%. Comparing base (ee3629c) to head (80579a7).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5005      +/-   ##
==========================================
- Coverage   83.97%   83.95%   -0.02%     
==========================================
  Files         178      178              
  Lines       17834    17834              
  Branches     3170     3170              
==========================================
- Hits        14976    14973       -3     
- Misses       1899     1900       +1     
- Partials      959      961       +2     

see 2 files with indirect coverage changes