Added geospatial query tests for $geoWithin

[vic-tsang]

This PR contains:

• geospatial query tests for $geoWithin

Dependency on #169

• reusing BSON comparison framework to test out BSON types for $geoWIthin

Ref:

• Issue Add compatibility test for query: geospatial operators (11 total) #32

[documentdb-triage-tool]

🤖 Auto-triaged by documentdb-triage-tool.

Applied: compatibility test, enhancement
Project fields suggested: Component test-coverage · Priority P2 · Effort XL · Status Needs Review
Confidence: 0.85 (mixed)

Reasoning

component from path globs (test-coverage, test-framework); effort from diff stats (4204+1 LOC, 19 files); LLM: Adds new geospatial $geoWithin query test cases to the compatibility test suite, a meaningful coverage expansion referencing a tracked feature issue.

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