v0.2.0

Sync with upstream fastapi-limiter 0.2.0 (pyrate-limiter rewrite). Breaking.

• Add ValkeyBucket — pyrate_limiter.RedisBucket typed for the valkey client.
• Remove the old FastAPILimiter (global init/close + Lua/evalsha).
• Import module renamed fastapi_limiter → fastapi_limiter_valkey; now depends on upstream fastapi-limiter>=0.2.0.
• Build/tooling migrated Poetry → uv + ruff + ty.

See CHANGELOG.md for details.