feat: Infinispan vector-io provider

[rigazilla]

What does this PR do?

Add Infinispan as vector-io provider. Infinispan Home

Closes #2961

Test Plan

Ran vector io test suite, and all test passed

$ pytest -sv     --stack-config="files=inline::localfs,inference=inline::sentence-transformers,vector_io=remote::infinispan"     tests/integration/vector_io/test_vector_io.py 
================================================================ test session starts =================================================================
platform linux -- Python 3.14.2, pytest-9.0.2, pluggy-1.6.0 -- /home/rigazilla/llama/llama-stack/.venv/bin/python3
cachedir: .pytest_cache
rootdir: /home/rigazilla/llama/llama-stack
configfile: pyproject.toml
plugins: anyio-4.12.1, asyncio-1.3.0
asyncio: mode=Mode.AUTO, debug=False, asyncio_default_fixture_loop_scope=None, asyncio_default_test_loop_scope=function
collected 12 items                                                                                                                                   

tests/integration/vector_io/test_vector_io.py::test_vector_store_retrieve[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768] 
instantiating llama_stack_client
llama_stack_client instantiated in 1.286s
PASSED
tests/integration/vector_io/test_vector_io.py::test_vector_store_register[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768] PASSED
tests/integration/vector_io/test_vector_io.py::test_insert_chunks[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768-test_case0] Warning: You are sending unauthenticated requests to the HF Hub. Please set a HF_TOKEN to enable higher rate limits and faster downloads.
WARNING  2026-02-05 17:18:41,852 huggingface_hub.utils._http:779 uncategorized: Warning: You are sending unauthenticated
         requests to the HF Hub. Please set a HF_TOKEN to enable higher rate limits and faster downloads.               
WARNING  2026-02-05 17:18:44,152                                                                                        
         transformers_modules.nomic_hyphen_ai.nomic_hyphen_bert_hyphen_2048.7710840340a098cfb869c4f65e87cf2b1b70caca.mod
         eling_hf_nomic_bert:466 uncategorized: <All keys matched successfully>                                         
PASSED
tests/integration/vector_io/test_vector_io.py::test_insert_chunks_with_precomputed_embeddings[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768] PASSED
tests/integration/vector_io/test_vector_io.py::test_query_returns_valid_object_when_identical_to_embedding_in_vdb[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768] PASSED
tests/integration/vector_io/test_vector_io.py::test_auto_extract_embedding_dimension[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768] PASSED
tests/integration/vector_io/test_vector_io.py::test_provider_auto_selection_single_provider[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768] PASSED
tests/integration/vector_io/test_vector_io.py::test_provider_id_override[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768] PASSED
tests/integration/vector_io/test_vector_io.py::test_insert_chunks[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768-test_case1] PASSED
tests/integration/vector_io/test_vector_io.py::test_insert_chunks[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768-test_case2] PASSED
tests/integration/vector_io/test_vector_io.py::test_insert_chunks[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768-test_case3] PASSED
tests/integration/vector_io/test_vector_io.py::test_insert_chunks[vector_io=infinispan-emb=inline::sentence-transformers/nomic-ai/nomic-embed-text-v1.5:dim=768-test_case4] PASSED

Even CI is happy, see: https://github.com/rigazilla/llama-stack/actions/runs/21718857111

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