fix(ingest/mongodb): add missing bytes and DatetimeMS type mappings

[JohnRTurner]

Summary

• Adds bytes and bson.datetime_ms.DatetimeMS entries to PYMONGO_TYPE_TO_MONGO_TYPE and _field_type_mapping in the MongoDB source.
• BSON Binary fields (subtype 0) decode to plain bytes, and out-of-range datetimes decode to bson.datetime_ms.DatetimeMS (relevant since this connector sets datetime_conversion="DATETIME_AUTO"). Neither type was previously mapped, so affected fields fell back to "unknown"/NullTypeClass with an "Unrecognized column type" warning instead of being typed as binary/date.

Test plan

• Verified via ./gradlew :metadata-ingestion:lintFix
• Manually confirmed via BSON encode/decode that Binary subtype 0 decodes to bytes and an out-of-range datetime under DATETIME_AUTO decodes to bson.datetime_ms.DatetimeMS, and that both now resolve correctly through the updated dicts
• Existing MongoDB unit tests pass (pytest tests/unit/test_mongodb_source.py, 14 passed)

🤖 Generated with Claude Code

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Summary by cubic

Map BSON Binary and out-of-range datetimes to the correct types in the MongoDB source. Previously, bytes and bson.datetime_ms.DatetimeMS decoded values were unrecognized and emitted as unknown/NullType with warnings; now they map to binary/date, removing those warnings and aligning with datetime_conversion="DATETIME_AUTO".

• Add bytes -> "binary"/BytesTypeClass and bson.datetime_ms.DatetimeMS -> "date"/TimeTypeClass entries in PYMONGO_TYPE_TO_MONGO_TYPE and _field_type_mapping.
• Behavior change: fields decoded as bytes or bson.datetime_ms.DatetimeMS now emit binary/date schema types; expect fewer warnings and possible schema updates in emitted metadata. No configuration changes required.

^{Written for commit d7edbf0. Summary will update on new commits.}

[cursor]

PR Summary

Overview
MongoDB schema inference now types BSON Binary (decoded as bytes) and out-of-range datetimes (bson.datetime_ms.DatetimeMS under DATETIME_AUTO) as binary and date instead of falling back to unknown/NullTypeClass with unrecognized-type warnings.

Adds those entries to PYMONGO_TYPE_TO_MONGO_TYPE and _field_type_mapping in the MongoDB source.

^{Reviewed by Cursor Bugbot for commit d7edbf0. Bugbot is set up for automated code reviews on this repo. Configure here.}

[cubic-dev-ai]

No issues found across 1 file

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