Added geospatial tests for $nearSphere

[vic-tsang]

This PR contains:

• geospatial tests for $nearSphere

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 L · Status Needs Review
Confidence: 0.85 (mixed)

Reasoning

component from path globs (test-coverage, test-framework); effort from diff stats (1845+0 LOC, 11 files); LLM: Adds new geospatial test coverage for the $nearSphere operator, expanding compatibility test suite with no framework or schema changes implied.

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[eerxuan]

Apart from feedback from #218 (comment), LGTM.

[vic-tsang]

Indexes are not created per test instead of relying on setup.