Tests: Start crate from testcontainers instead of cratedb-toolkit

[florinutz]

sqlalchemy-cratedb's tests start crate through cratedb-toolkit, and the toolkit depends on sqlalchemy-cratedb, so a change here can break the suite until both packages release (#320, crate/cratedb-toolkit#913).

The cratedb_service fixture now starts crate from the CrateDBContainer class of testcontainers, through a small CrateDBTestAdapter in tests/util.py. It holds the engine and the SQL helpers used by the tests (run_sql, refresh_table, count_records), so the test extra installs testcontainers>=4.15,<5 and httpx instead of cratedb-toolkit[testing]. The extra lists those two rather than testcontainers[cratedb], because that extra also installs sqlalchemy-cratedb from PyPI. The tests would then depend on a released copy of this package again.

The fixture runs the crate version from CRATEDB_VERSION (nightly by default). Nightly comes from crate/crate:nightly, and a released version comes from the official crate:<version> image, because the release tags of crate/crate are amd64-only.

Closes #320.

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