[FEAT] Enable Comparison between timestamp / dates

[samster25]

• Enables comparisons between Timestamps of no / same / different timezones and units
• Enables comparisons between dates and timestamps
• Adds Date / Timestamps to expression fixtures
• However we do not allow compare a TimeStamp with no tz with one that has one.

[codecov]

Codecov Report

Merging #1689 (2329aff) into main (17bc896) will decrease coverage by 0.22%.
Report is 1 commits behind head on main.
The diff coverage is 83.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1689      +/-   ##
==========================================
- Coverage   85.10%   84.89%   -0.22%     
==========================================
  Files          55       55              
  Lines        5345     5349       +4     
==========================================
- Hits         4549     4541       -8     
- Misses        796      808      +12     

Files	Coverage Δ
daft/datatype.py	91.75% <83.33%> (-0.24%)	⬇️

... and 6 files with indirect coverage changes