add PEP 249 DB API constructors

[joe-clickhouse]

Summary

• Adds the PEP 249 Binary, Date, Time, Timestamp, and *FromTicks constructors.
• Fixes SQLAlchemy LargeBinary inserts raising AttributeError when the dialect calls dbapi.Binary.
• Adds direct constructor, local-time tick conversion, fractional tick, and SQLAlchemy consumer coverage.
• Leaves time binding and the pre-existing LargeBinary read behavior for separate work.
• Addresses the Binary constructor failure in Two Core types cannot be bound through the DBAPI: LargeBinary (no PEP 249 Binary constructor) and Time #919 but does not fully close it.

Co-authored by @sankalpsthakur

Checklist

Delete items not relevant to your PR:

• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG
• For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

[Copilot]

Pull request overview

This PR completes the PEP 249 constructor surface for clickhouse_connect.dbapi by adding Binary, Date, Time, Timestamp, plus the *FromTicks helpers. This resolves SQLAlchemy LargeBinary binding failures where the dialect expects dbapi.Binary to exist.

Changes:

• Add PEP 249 type constructors and *FromTicks functions to clickhouse_connect.dbapi.
• Add unit tests covering constructors and verifying SQLAlchemy’s import_dbapi() exposes Binary.
• Update documentation and changelog to reflect the DB-API surface addition.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
clickhouse_connect/dbapi/__init__.py	Adds PEP 249 constructors (Binary, Date, Time, Timestamp) and tick-based constructor functions.
tests/unit_tests/test_driver/test_dbapi_types.py	New unit tests validating constructor behavior and SQLAlchemy dialect consumption.
docs/driver-api.mdx	Documents the newly supported PEP 249 constructors and tick helpers.
CHANGELOG.md	Adds a user-visible bugfix entry referencing the SQLAlchemy LargeBinary binding fix and issue #919.