add support for prompt adapters

[prashantgupta24]

Depends on upstream PR - vllm-project/vllm#4645

[dtrifiro]

You can now test this by setting VLLM_VERSION_OVERRIDE=git+https://github.com/SwapnilDreams100/vllm@main and running the nox session or by adding the version in the test workflow matrix:

https://github.com/opendatahub-io/vllm-tgis-adapter/blob/main/.github/workflows/tests.yaml#L33-L37

        vllm_version:
          # - "" # skip the pypi version as it will not work on CPU
          - "git+https://github.com/vllm-project/vllm@v0.5.0.post1"
          - "git+https://github.com/vllm-project/vllm@main"
          - "git+https://github.com/opendatahub-io/vllm@main" 
+         - "git+https://github.com/SwapnilDreams100/vllm@main"

[dtrifiro]

@prashantgupta24 with the last push:

• bumped vllm minimum version to 0.5.1
• gotten rid of some flags for compatibility pre-0.5.1 compatibility
• updated __main__ for the new prompt_adapters argument
• minor change in the adapter store initial setup
• maintain compatibility with 0.5.1

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 63.63636% with 12 lines in your changes missing coverage. Please review.

Project coverage is 63.58%. Comparing base (9cfbf95) to head (b232f9e).

Files	Patch %	Lines
src/vllm_tgis_adapter/grpc/adapters.py	38.46%	7 Missing and 1 partial ⚠️
src/vllm_tgis_adapter/grpc/grpc_server.py	73.33%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   63.16%   63.58%   +0.42%     
==========================================
  Files          18       18              
  Lines        1208     1211       +3     
  Branches      213      213              
==========================================
+ Hits          763      770       +7     
+ Misses        372      370       -2     
+ Partials       73       71       -2     

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