libs/genai/v3.1.0

Changes since libs/genai/v3.0.3

feat(genai): support gemini 3 (#1365)
chore(genai): update URLs for image tests (#1363)
feat(genai): store thought signatures in additional_kwargs (#1358)
fix(genai, vertexai): thought signature handling (#1354)
chore(genai)!: delete Attributed Question Answer (AQA) service interfaces (#1343)
chore(genai): mark google_vector_store module deprecated (#1350)
fix(genai): delete dead functions (#1346)
docs(genai): add example for get_num_tokens (#1345)
chore(genai): clean up pyproject.toml (#1344)
refactor(genai): additional tests work (#1328)
refactor(genai): tests (#1327)