Enable Feature Factory to support LLMs RAG

[lyliyu]

Added LLMs support in Feature Factory:

An API to process a directory of documents and generate a dataframe with text chunks
Classes and functions to enable document parsing and chunking
Classes can be extended for new chunking approaches
A demo notebook

[codecov]

Codecov Report

Attention: 47 lines in your changes are missing coverage. Please review.

Comparison is base (d898d5c) 80.81% compared to head (b079aa2) 82.26%.

❗ Current head b079aa2 differs from pull request most recent head c3216a2. Consider uploading reports for the commit c3216a2 to get more accurate results

Files	Patch %	Lines
framework/feature_factory/llm_tools.py	85.71%	22 Missing and 9 partials ⚠️
framework/feature_factory/__init__.py	70.00%	6 Missing ⚠️
framework/feature_factory/helpers.py	25.00%	6 Missing ⚠️
framework/feature_factory/agg_granularity.py	85.71%	3 Missing ⚠️
framework/feature_factory/catalog.py	96.15%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   80.81%   82.26%   +1.44%     
==========================================
  Files          16       21       +5     
  Lines        1173     1522     +349     
  Branches      183      235      +52     
==========================================
+ Hits          948     1252     +304     
- Misses        173      209      +36     
- Partials       52       61       +9     

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