Move CUDA files to separate folder

Fix model docstrings (vllm-project#1764)

Bump up to v0.2.2 (vllm-project#1689)

Bump up the version to v0.2.1 (vllm-project#1355)

Bump up the version to v0.2.0 (vllm-project#1212)

Bump up the version to v0.1.7 (vllm-project#1013)

Bump up the version to v0.1.6 (vllm-project#989)

Bump up the version to v0.1.5 (vllm-project#944)

Bump up the version to v0.1.4 (vllm-project#846)