feat(firestore): support object functions

[Linchin]

• map_set()
• map_keys()
• map_values()
• map_entries()

[gemini-code-assist]

Summary of Changes

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This pull request enhances Firestore's expression capabilities by introducing the map_set function. This new feature allows for programmatic updates or additions of key-value pairs within map fields directly through pipeline expressions, providing greater flexibility and control over data manipulation within documents.

Highlights

• New map_set function: Introduced the map_set method to the Expression class in pipeline_expressions.py, allowing users to add or update key-value pairs within map fields using Firestore expressions.
• Unit Tests: Added comprehensive unit tests for the map_set function in test_pipeline_expressions.py to ensure its correct behavior and integration.
• System Tests: Included a new end-to-end system test case in map.yaml to validate the functionality of map_set within a complete Firestore pipeline.

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[gemini-code-assist]

Code Review

This pull request adds support for the map_set function in Firestore pipeline expressions, including the implementation, a system test, and a unit test. The changes are well-structured and the tests cover the new functionality appropriately. I have one minor suggestion to fix a typo in the docstring for consistency.

[daniel-sanche]

LGTM, but consider improving test coverage

[daniel-sanche]

do we have a test covering this?