Add dynamic search rule filter support

[kangazhan]

Summary

• parse the new lastUpdatedAt dynamic search rule response field as a Python datetime
• cover filter activation conditions with an API round-trip test
• keep responses from older Meilisearch versions compatible when lastUpdatedAt is absent

Fixes #1267

Validation

• .venv\Scripts\pytest.exe -q tests\models\test_search_rule.py tests\client\test_client_dynamic_search_rules_meilisearch.py (8 passed)
• .venv\Scripts\ruff.exe check meilisearch\models\search_rule.py tests\models\test_search_rule.py tests\client\test_client_dynamic_search_rules_meilisearch.py
• .venv\Scripts\ruff.exe format --check meilisearch\models\search_rule.py tests\models\test_search_rule.py tests\client\test_client_dynamic_search_rules_meilisearch.py
• .venv\Scripts\mypy.exe meilisearch
• full local suite: 374 passed, 5 skipped, 3 environment-specific failures; the same three failures reproduce on an untouched origin/main worktree (two require the CI Enterprise image and one is affected by local HTTP interception)

AI disclosure

OpenAI Codex was used to draft the model and test changes; I reviewed the diff and verified the behavior with the checks above.

Summary by CodeRabbit

• New Features

  • Search rules now include an optional “last updated” timestamp.
  • Timestamp values are automatically converted to standard date-time objects.
  • Dynamic search rules support filter-based conditions when updating rules.

• Bug Fixes

  • Improved consistency when retrieving dynamic search rules with pagination or filters.

[coderabbitai]

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