[FEAT] Micropartition integration and tests

[jaychia]

1. Adds a DAFT_MICROPARTITIONS=1 flag to enable usage of MicroPartition instead of Table for execution
2. Adds tests and implementations for micropartition methods

[codecov]

Codecov Report

Merging #1502 (1dd87d0) into main (15085f5) will increase coverage by 0.47%.
The diff coverage is 90.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1502      +/-   ##
==========================================
+ Coverage   74.73%   75.21%   +0.47%     
==========================================
  Files          60       61       +1     
  Lines        6140     6335     +195     
==========================================
+ Hits         4589     4765     +176     
- Misses       1551     1570      +19     

Files	Coverage Δ
daft/execution/execution_step.py	92.83% <100.00%> (+0.01%)	⬆️
daft/runners/ray_runner.py	90.55% <ø> (ø)
daft/table/__init__.py	100.00% <100.00%> (ø)
daft/table/table.py	82.06% <100.00%> (+0.12%)	⬆️
daft/viz/dataframe_display.py	93.18% <100.00%> (ø)
daft/table/micropartition.py	89.83% <89.83%> (ø)