text-splitters: Add JSFrameworkTextSplitter for Handling JavaScript Framework Code (#28972)

## Description
This pull request introduces a new text splitter,
`JSFrameworkTextSplitter`, to the Langchain library. The
`JSFrameworkTextSplitter` extends the `RecursiveCharacterTextSplitter`
to handle JavaScript framework code effectively, including React (JSX),
Vue, and Svelte. It identifies and utilizes framework-specific component
tags and syntax elements as splitting points, alongside standard
JavaScript syntax. This ensures that code is divided at natural
boundaries, enhancing the parsing and processing of JavaScript and
framework-specific code.

### Key Features
- Supports React (JSX), Vue, and Svelte frameworks.
- Identifies and uses framework-specific tags and syntax elements as
natural splitting points.
- Extends the existing `RecursiveCharacterTextSplitter` for seamless
integration.

## Issue
No specific issue addressed.

## Dependencies
No additional dependencies required.

---------

Co-authored-by: ccurme <chester.curme@gmail.com>

libs/text-splitters/langchain_text_splitters/__init__.py

@@ -36,6 +36,7 @@ from langchain_text_splitters.html import (
     HTMLSemanticPreservingSplitter,
 )
 from langchain_text_splitters.json import RecursiveJsonSplitter
+from langchain_text_splitters.jsx import JSFrameworkTextSplitter
 from langchain_text_splitters.konlpy import KonlpyTextSplitter
 from langchain_text_splitters.latex import LatexTextSplitter
 from langchain_text_splitters.markdown import (
@@ -60,6 +61,7 @@ __all__ = [
     "RecursiveCharacterTextSplitter",
     "RecursiveJsonSplitter",
     "LatexTextSplitter",
+    "JSFrameworkTextSplitter",
     "PythonCodeTextSplitter",
     "KonlpyTextSplitter",
     "SpacyTextSplitter",