community[patch]: Add missing annotations (#24890)

This PR adds annotations in comunity package.

Annotations are only strictly needed in subclasses of BaseModel for
pydantic 2 compatibility.

This PR adds some unnecessary annotations, but they're not bad to have
regardless for documentation pages.

libs/community/tests/unit_tests/embeddings/test_ollama.py

@@ -5,7 +5,7 @@ from langchain_community.embeddings.ollama import OllamaEmbeddings
 
 
 class MockResponse:
-    status_code = 200
+    status_code: int = 200
 
     def json(self) -> dict:
         return {"embedding": [1, 2, 3]}