feat: generated columns [WIP]

[ion-elgreco]

Description

Adds generated columns.

Related Issue(s)

• closes Generated Columns #3116

TODO

• add rust/python tests
• add column generation to MERGE
• Add tests for improved protocol setting based on schema (timestampntz, invariants, generated columns)
• Verify whether generated columns can only be added during creation, and not during schema evolution or add columns :S

[codecov]

Codecov Report

Attention: Patch coverage is 57.05706% with 143 lines in your changes missing coverage. Please review.

Project coverage is 72.15%. Comparing base (1521a08) to head (5db1970).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/operations/write.rs	32.92%	51 Missing and 4 partials ⚠️
crates/core/src/operations/merge/mod.rs	53.84%	30 Missing and 12 partials ⚠️
crates/core/src/operations/add_column.rs	0.00%	16 Missing ⚠️
crates/core/src/kernel/models/actions.rs	83.58%	3 Missing and 8 partials ⚠️
crates/core/src/table/mod.rs	50.00%	9 Missing ⚠️
crates/core/src/kernel/models/schema.rs	68.18%	4 Missing and 3 partials ⚠️
crates/core/src/delta_datafusion/mod.rs	81.81%	1 Missing and 1 partial ⚠️
crates/core/src/operations/create.rs	94.44%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3123      +/-   ##
==========================================
- Coverage   72.25%   72.15%   -0.10%     
==========================================
  Files         134      134              
  Lines       42973    43175     +202     
  Branches    42973    43175     +202     
==========================================
+ Hits        31050    31155     +105     
- Misses       9929    10010      +81     
- Partials     1994     2010      +16     

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