docs: add CoherenceVectorStore integration #46217

Job	Run time
Detect Changes & Set Matrix	16s
⚡ CodSpeed Benchmarks (libs/partners/coherence, 3.12)	1m 25s
Extended Tests	0s
test (libs/partners/coherence, 3.9) / Python 3.9	45s
test (libs/partners/coherence, 3.13) / Python 3.13	4m 5s
test-doc-imports (3.12) / 🔍 Check Doc Imports (Python 3.12)	29s
lint (libs/partners/coherence, 3.13) / Python 3.13	18m 24s
lint (., 3.9) / Python 3.9	27s
lint (., 3.12) / Python 3.12	22s
lint (libs/partners/coherence, 3.9) / Python 3.9	1m 43s
test-pydantic (libs/partners/coherence, 2.7.0, 3.11) / Pydantic ~=2.7.0	39s
test-pydantic (libs/partners/coherence, 2.8.0, 3.11) / Pydantic ~=2.8.0	43s
test-pydantic (libs/partners/coherence, 2.9.0, 3.11) / Pydantic ~=2.9.0	43s
test-pydantic (libs/partners/coherence, 2.10.0, 3.11) / Pydantic ~=2.10.0	42s
test-pydantic (libs/partners/coherence, 2.11.0, 3.11) / Pydantic ~=2.11.0	42s
compile-integration-tests (libs/partners/coherence, 3.13) / Python 3.13	3m 56s
compile-integration-tests (libs/partners/coherence, 3.9) / Python 3.9	47s
✅ CI Success	3s
	36m 11s

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