Ai-microcore

- Renamed texts.clean() to texts.clear().
- Added missing methods save(), get_all() to Embedding DB Proxy.
- Added get_all() to Embedding DB base class.
- ChromaDB: get_all now returns complete wrapped search results with metadata, not just documents.
- Fixed an issue where the LLM would not work correctly when passing an empty value to the callback argument.

Changes
- Wrappers improvements, new methods introduced: tpl(...).to_llm(), async tpl(...).to_allm(), llm(...).parse_json()
- Error classes added
- Chat role constants added

Changelog
- Introduced an asynchronous LLM function: async allm(prompt, **kwargs)
- Chat message types (Msg, UserMsg, SysMsg, AssistantMsg) are now directly accessible from the microcore package.