feat(python): reading/writing transaction identifiers in python

[PeterKeDer]

Description

We'd like to read/write the delta transaction identifiers for stream processing. It seems that this is currently available to through rust but not python. This PR adds the following to the python API:

• app_transactions field in CommitProperties, which is a list of the Transaction class (PyTransaction in rust)
• DeltaTable.transaction_versions for accessing the latest transaction of a delta table, which returns a dictionary of app id -> Transaction

Would like some feedback on the naming/API. I'm not sure which is the correct terminology to use - "app transaction" vs "transaction version" vs "transaction identifier"? The delta protocol refers to it as transaction identifiers.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 44 lines in your changes missing coverage. Please review.

Project coverage is 72.36%. Comparing base (7a3b03f) to head (eb57bf6).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
python/src/lib.rs	0.00%	44 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2942      +/-   ##
==========================================
- Coverage   72.41%   72.36%   -0.06%     
==========================================
  Files         131      131              
  Lines       40542    40586      +44     
  Branches    40542    40586      +44     
==========================================
+ Hits        29358    29369      +11     
- Misses       9290     9332      +42     
+ Partials     1894     1885       -9     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[houqp]

transaction identifier would have been a better name if we are to start from scratch, but to keep it consistent with the rust core, it's better to keep using app transaction for now.

[ion-elgreco]

Nice work!