feat: Adding Semantic Text Splitter Component (Text Splitters)

[joaoguilhermeS]

Feat: Semantic Text Splitter with Advanced Threshold Controls

Overview
Introduces a new Semantic Text Splitter component that provides flexible text chunking with statistical threshold controls and regex support.

Features:

• Multiple threshold control methods:
  • Percentile-based splitting
  • Standard deviation thresholds
  • Interquartile range
• Configurable chunk size and count
• Optional regex-based splitting

[edwinjosechittilappilly]

@joaoguilhermeS is langchain_experimental a part of the pyproject of langflow? if not @ogabrielluiz can we add it to the pyproject?
@joaoguilhermeS Can you confirm if it's already added by uv to the pyproject file?

Also, I suggest we add the beta as True in the component since it is a part of langchain_experimental