feat: Integrate column expressions in certain validation methods with Ibis source tables

[rich-iannone]

This PR is analogous to #2 , except that the column expressions in select validation methods are made to work with Ibis backend tables (could be of type Parquet, DuckDB, MySQL, etc.).

[codecov]

Codecov Report

Attention: Patch coverage is 98.28571% with 3 lines in your changes missing coverage. Please review.

Project coverage is 99.64%. Comparing base (cdb53c8) to head (fa2f9cc).
Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
pointblank/validate.py	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
- Coverage   99.84%   99.64%   -0.20%     
==========================================
  Files          10       10              
  Lines        1272     1417     +145     
==========================================
+ Hits         1270     1412     +142     
- Misses          2        5       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.