feat: Introduce cel ast rebuilder

[skynetigor]

Closes #4573

📑 Description

• Make fields accessing index-friendly during CEL-to-SQL

✅ Checks

• [ ] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [ ] All the tests have passed

ℹ Additional Information

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
keep	⬜️ Ignored (Inspect)	Visit Preview		May 21, 2025 2:15pm

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 19.14894% with 114 lines in your changes missing coverage. Please review.

Project coverage is 30.85%. Comparing base (d39afd3) to head (d792977). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
keep/api/core/cel_to_sql/cel_ast_rebuilder.py	13.25%	72 Missing :warning:
keep/api/core/cel_to_sql/sql_providers/base.py	23.07%	10 Missing :warning:
keep/api/core/cel_to_sql/sql_providers/sqlite.py	27.27%	8 Missing :warning:
keep/api/core/cel_to_sql/ast_nodes.py	22.22%	7 Missing :warning:
keep/api/core/cel_to_sql/sql_providers/mysql.py	22.22%	7 Missing :warning:
...ep/api/core/cel_to_sql/sql_providers/postgresql.py	25.00%	6 Missing :warning:
keep/api/core/cel_to_sql/properties_mapper.py	33.33%	4 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4621       +/-   ##
===========================================
- Coverage   46.77%   30.85%   -15.92%     
===========================================
  Files         164       94       -70     
  Lines       16841    10705     -6136     
===========================================
- Hits         7877     3303     -4574     
+ Misses       8964     7402     -1562     

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