feat: merge latest changes from crewAI-tools main into packages/tools

- Merged upstream changes from crewAI-tools main branch
- Resolved conflicts due to monorepo structure (crewai_tools -> src/crewai_tools)
- Removed deprecated embedchain adapters
- Added new RAG loaders and crewai_rag_adapter
- Consolidated dependencies in pyproject.toml

Fixed critical linting issues:
- Added ClassVar annotations for mutable class attributes
- Added timeouts to requests calls (30s default)
- Fixed exception handling with proper 'from' clauses
- Added noqa comments for public API functions (backward compatibility)
- Updated ruff config to ignore expected patterns:
  - F401 in __init__ files (intentional re-exports)
  - S101 in test files (assertions are expected)
  - S607 for subprocess calls (uv/pip commands are safe)

Remaining issues are from upstream code and will be addressed in separate PRs.

packages/tools/src/crewai_tools/rag/source_content.py

@@ -1,8 +1,8 @@
 import os
-from urllib.parse import urlparse
-from typing import TYPE_CHECKING
-from pathlib import Path
 from functools import cached_property
+from pathlib import Path
+from typing import TYPE_CHECKING
+from urllib.parse import urlparse
 
 from crewai_tools.rag.misc import compute_sha256
 
@@ -34,7 +34,7 @@ class SourceContent:
 
     @cached_property
     def source_ref(self) -> str:
-        """"
+        """ "
         Returns the source reference for the content.
         If the content is a URL or a local file, returns the source.
         Otherwise, returns the hash of the content.