feat(streaming): complete StreamingPiiPolicy parity with EntityType and server entities

[pylrn]

Summary

Completes StreamingPiiPolicy enum parity with EntityType and PIIRedactionPolicy in assemblyai/types.py as well as server-side AAIEntities (which matches StreamingPiiPolicy in the Node SDK).

In addition to granular location policies (location_address, location_address_street, location_city, location_coordinate, location_country, location_state, location_zip), this adds the remaining 11 missing entity types:

• corporate_action
• day
• effect
• financial_metric
• medical_code
• month
• organization_id
• product
• project
• trend
• year

Bringing all 65 entity types supported across AssemblyAI into full typed parity in streaming real-time sessions.

Changes

• assemblyai/streaming/v3/models.py: Expose granular location and general audio intelligence entity policies on StreamingPiiPolicy.
• assemblyai/__version__.py: Bump to 1.6.2.
• tests/unit/test_streaming.py & tests/unit/test_streaming_async.py: Add unit tests verifying serialization and parameter acceptance for newly added entity policies, plus an assert test ensuring StreamingPiiPolicy enum values match EntityType 1:1.

Verification

• All sync and async streaming unit tests pass (141 passed).
• Parity test verifies set(e.value for e in EntityType) == set(p.value for p in StreamingPiiPolicy).
• ruff check assemblyai --config ./ruff.toml and ruff format --check --config ./ruff.toml assemblyai pass cleanly.