feat: auto-apply Snowflake ownership object tags on publish

[Vinay Shende (vinay79n)]

Implements the table-ownership RFC (RFC: Snowflake table ownership via object tag) by tagging tables through the existing
publish chokepoint instead of hundreds of hand-written ALTER statements.

• Add _snowflake/object_tags.py: build_table_tags (derive OWNER/TEAM/DOMAIN/
  PROJECT from Metaflow context, default STATUS=active, validate STATUS/SLA),
  build_set_tag_sql, and apply_table_tags (warn-don't-fail on missing tag defs)
• Wire prod-only tagging into publish() and publish_pandas() via a new optional
  tags override; non-prod (DATA_SCIENCE_STAGE) runs are left untouched
• Add metaflow/registry.py: create_ownership_registry_view() + TABLE_OWNERSHIP_
  REGISTRY view (plain view, adoption-based, no refresh needed)
• Export create_ownership_registry_view from metaflow package
• Add unit tests (100% coverage of object_tags.py)
• Docs: publish/publish_pandas ownership-tags sections, registry view page
• Bump version 0.4.2 -> 0.5.0

ClickUp card - DS-2491

[Copilot]

Pull request overview

Adds first-class Snowflake table-ownership tagging to the Metaflow publish “chokepoints” and introduces an admin helper view that surfaces those tags via a central registry view.

Changes:

• Introduces _snowflake/object_tags.py to derive/validate ownership tags, generate ALTER TABLE … SET TAG SQL, and apply tags (warn-only on tagging failures).
• Wires optional tags overrides into publish() and publish_pandas() and applies tags for production tables.
• Adds create_ownership_registry_view() + docs to create/query the TABLE_OWNERSHIP_REGISTRY view; bumps version to 0.5.0.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uv.lock	Bumps locked project version to 0.5.0.
pyproject.toml	Bumps package version to 0.5.0 and updates authors.
src/ds_platform_utils/_snowflake/object_tags.py	New tag derivation/SQL builder/apply helpers for Snowflake object tags.
src/ds_platform_utils/metaflow/write_audit_publish.py	Adds tags parameter and applies tags post-SWAP in production.
src/ds_platform_utils/metaflow/pandas.py	Adds tags parameter and applies tags in production for both direct and S3-stage paths.
src/ds_platform_utils/metaflow/registry.py	New helper to create the ownership registry view in Snowflake.
src/ds_platform_utils/metaflow/init.py	Exports create_ownership_registry_view.
tests/unit_tests/snowflake/test__object_tags.py	New unit tests for tag derivation, SQL construction, and apply behavior.
README.md	Links to the new create_ownership_registry_view docs page.
docs/metaflow/publish.md	Documents the new tags param and ownership-tag behavior.
docs/metaflow/publish_pandas.md	Documents the new tags param and ownership-tag behavior.
docs/metaflow/create_ownership_registry_view.md	New docs for creating/querying the registry view.

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