Add vLLM Engine

[IlyaMescheryakov1402]

Adding vLLM Engine (v 0.7.3) with OpenAI API

Added routes:

• /v1/completions
• /v1/chat/completions
• /v1/models

Entrypoint for vLLM-OpenAI is http://127.0.0.1:8080/serve/openai/v1 (in its basic options). Endpoint name doesn't change entrypoint (as it does for other engines) according to OpenAI API. Endpoint name in that case equals served_model_name that can be send via openai api request.

vLLM engine can be configured via docker/docker-compose-gpu.yml (line 108, variable VLLM_ENGINE_ARGS). Model can be configured via preprocess.py file. For vllm deploy example see examples/vllm/readme.md

Other small fixes:

1. Add CLEARML_DEFAULT_SERVE_SUFFIX - to change entrypoint suffix and link
2. Fix searching control plane task in triton_helper (in case if we have more than 1 serving instance)
3. Add docker-compose-gpu.yml file for instances that serves models on GPU (for custom, custom_async and vllm engines)