Implement semantic chunking within RAG EXP ACC

[ritesh-modi]

Currently, RAGE provides different chunking methods. An additional semantic chunking method should be added which should be configurable.

[FlorianPydde]

what's the current recommended way to create a custom chunker ? If I understand correctly, one would have do the following:

1. In documentLoader.py -> add a new custom _FORMAT_PROCESSORS
2. create a customLoader that follows the ouput format of structuredLoader, like this:
   docsList.append({str(uuid.uuid4()): {"content": doc.page_content, "metadata":doc.metadata}})

Is my understanding correct ? @quovadim , @ritesh-modi