feat(python): add timestamp time travel in delta scan/read

[ion-elgreco]

Adds the timestamp time travel option in the read/scan_delta. Load_as_version is only used when the version is str or timestamp, if it's a numerical version we pass it right away to the DeltaTable class since that will skip reading additional log segments instead of first doing DeltaTable() and then load_as_version.

• closes Support time travel in read_delta #15692

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.39%. Comparing base (56dda21) to head (5d35324).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15813      +/-   ##
==========================================
- Coverage   80.40%   80.39%   -0.02%     
==========================================
  Files        1264     1263       -1     
  Lines      165423   165346      -77     
==========================================
- Hits       133011   132926      -85     
- Misses      32412    32420       +8     

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[ritchie46]

Thanks!