[FEAT] Enable MicroPartitions by default

[jaychia]

1. Switches to use DAFT_MICROPARTITIONS=1 behavior by default
2. Renames Table -> MicroPartition all across the codebase
3. Renames LegacyTable -> Table all across the codebase

[codecov]

Codecov Report

Merging #1684 (43ed1d7) into main (17bc896) will decrease coverage by 0.04%.
The diff coverage is 99.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1684      +/-   ##
==========================================
- Coverage   85.10%   85.07%   -0.04%     
==========================================
  Files          55       55              
  Lines        5345     5345              
==========================================
- Hits         4549     4547       -2     
- Misses        796      798       +2     

Files	Coverage Δ
daft/dataframe/dataframe.py	87.04% <100.00%> (ø)
daft/dataframe/preview.py	100.00% <100.00%> (ø)
daft/execution/rust_physical_plan_shim.py	98.59% <100.00%> (ø)
daft/filesystem.py	67.09% <100.00%> (ø)
daft/io/common.py	88.88% <100.00%> (ø)
daft/io/file_path.py	100.00% <100.00%> (ø)
daft/logical/map_partition_ops.py	55.17% <100.00%> (ø)
daft/runners/partitioning.py	80.45% <100.00%> (ø)
daft/runners/pyrunner.py	96.34% <100.00%> (-0.61%)	⬇️
daft/runners/ray_runner.py	88.69% <100.00%> (-0.25%)	⬇️
... and 6 more