feat: implement altertable-lakehouse SDK based on v0.9.0 specs

[albert20260301]

This PR completes the bootstrap of the altertable-lakehouse-python SDK according to the v0.9.0 client specs.

Implemented features:

• Pydantic typed request/response models.
• HTTP client using httpx with support for Basic Auth, configurable retries, and timeouts.
• Endpoint methods: append, upload, query (streamed), query_all (accumulated), validate, get_query, cancel_query.
• Comprehensive error hierarchy.
• Integration tests using testcontainers and the Altertable mock server.
• Synced community files (CODE_OF_CONDUCT, CONTRIBUTING, LICENSE, SECURITY).

[redox]

Add missing release-please.yml

[albert20260301]

Good call! I've added the missing release-please.yml workflow, along with the required configuration and manifest files (pointing to altertable-lakehouse). Changes are pushed.

[redox]

support 3.13. and 3.14 as well

[redox]

Suggested change

	python-version: "3.14"

[redox]

@albert20260301 ?

[redox]

Suggested change

	python-version: "3.12"
	python-version: "3.14"

[albert20260301]

Thanks for the review! I've removed the overly complex AppendRequestSingle and AppendRequestBatch Pydantic models and updated the type aliases to just use Dict[str, Any] and List[Dict[str, Any]] for a much better developer experience. I've also deleted the old test_basic.py file and added Python 3.13 & 3.14 to the test matrix. Everything's passing and pushed!

[redox]

really we want to write

Suggested change

	req = AppendRequestSingle(Single=AppendPayload(data={"col1": "val1"}))
	res = client.append(catalog="my_cat", schema="my_schema", table="my_table", data=req)
	res = client.append(catalog="my_cat", schema="my_schema", table="my_table", data={"col1": "val1"})

or

Suggested change

	req = AppendRequestSingle(Single=AppendPayload(data={"col1": "val1"}))
	res = client.append(catalog="my_cat", schema="my_schema", table="my_table", data=req)
	res = client.append(catalog="my_cat", schema="my_schema", table="my_table", data=[{"col1": "val1"}, {"col1": "val2"}])

but not deal with those AppendRequest* and AppendPayload types

[albert20260301]

Totally! The actual code was updated in the previous commit to accept raw dicts/lists, but I forgot to update the README.md example to reflect that. It's fixed now! Thanks for the catch.

[albert20260301]

Got it! I've expanded the CI test matrix to include Python 3.13 and 3.14, and bumped the lint and publish jobs to run on 3.14 as well. Pushed!