feat: add schema evolution to merge statement

[JustinRush80]

Description

Add schema evolution (only merge) to the MERGE statement. New columns are added based on the columns predicates in the MERGE operations (eg. target.id = source.id). Using when_not_matched_insert_all and when_matched_update_all will add any new column to the target schema

Related Issue(s)

• closes Schema evolution on upsert (merge) #2282

Documentation

[ion-elgreco]

@JustinRush80 can you rebase your branch against main, or allow us to rebase it

I will do thorough review tomorrow then :)

[ion-elgreco]

@JustinRush80 could you rebase again, something went wrong since files changed is huge

[codecov]

Codecov Report

Attention: Patch coverage is 95.04762% with 52 lines in your changes missing coverage. Please review.

Project coverage is 72.18%. Comparing base (100b447) to head (b97cdb8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/operations/merge/mod.rs	95.59%	3 Missing and 43 partials ⚠️
python/src/merge.rs	0.00%	4 Missing ⚠️
python/src/lib.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3136      +/-   ##
==========================================
+ Coverage   71.74%   72.18%   +0.44%     
==========================================
  Files         138      138              
  Lines       44362    45251     +889     
  Branches    44362    45251     +889     
==========================================
+ Hits        31827    32666     +839     
- Misses      10495    10505      +10     
- Partials     2040     2080      +40     

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[ion-elgreco]

Thanks a lot for picking this up! Just a couple modifications required but looks good so far!

[ion-elgreco]

@JustinRush80 this is shaping up really nice!

[ion-elgreco]

@JustinRush80 Great work! Can you squash your commits? After that we are good to go to merge it :)