Fix collection and query iterable issue #4
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−10
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What this PR fixes
Solves #51.
Bug – CollectionReference.get() returned the raw generator produced by stream().
In real google-cloud-firestore, get() is eager: it materialises the stream and returns a list[DocumentSnapshot].
Consuming code that expected parity (e.g. len(col.get()) or random-index access) raised TypeError: object of type 'generator' has no len().
Backward Compatibility
No breaking changes. Existing code that already consumed the generator continues to work (list(col.get()) still returns a list). Only incorrect behaviour is corrected.