[FEAT] show full schema on request

[samster25]

• Shows full schema when calling df.schema()
• preserves current behavior when calling repr(df)
  closes: Better repr for schema #1725

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (05e3e3f) 85.41% compared to head (b16a5cb) 85.48%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1868      +/-   ##
==========================================
+ Coverage   85.41%   85.48%   +0.06%     
==========================================
  Files          55       55              
  Lines        6190     6192       +2     
==========================================
+ Hits         5287     5293       +6     
+ Misses        903      899       -4     

Files	Coverage Δ
daft/logical/schema.py	91.37% <100.00%> (+0.15%)	⬆️
daft/viz/dataframe_display.py	93.18% <100.00%> (ø)

... and 4 files with indirect coverage changes