langchain[patch]: Add konlpy based text splitting for Korean (#16003)

- **Description:** Adds a text splitter based on
[Konlpy](https://konlpy.org/en/latest/#start) which is a Python package
for natural language processing (NLP) of the Korean language. (It is
like Spacy or NLTK for Korean)
- **Dependencies:** Konlpy would have to be installed before this
splitter is used,
  - **Twitter handle:** @untilhamza

libs/langchain/langchain/text_splitter.py

@@ -1427,6 +1427,37 @@ class SpacyTextSplitter(TextSplitter):
         return self._merge_splits(splits, self._separator)
 
 
+class KonlpyTextSplitter(TextSplitter):
+    """Splitting text using Konlpy package.
+
+    It is good for splitting Korean text.
+    """
+
+    def __init__(
+        self,
+        separator: str = "\n\n",
+        **kwargs: Any,
+    ) -> None:
+        """Initialize the Konlpy text splitter."""
+        super().__init__(**kwargs)
+        self._separator = separator
+        try:
+            from konlpy.tag import Kkma
+        except ImportError:
+            raise ImportError(
+                """
+                Konlpy is not installed, please install it with 
+                `pip install konlpy`
+                """
+            )
+        self.kkma = Kkma()
+
+    def split_text(self, text: str) -> List[str]:
+        """Split incoming text and return chunks."""
+        splits = self.kkma.sentences(text)
+        return self._merge_splits(splits, self._separator)
+
+
 # For backwards compatibility
 class PythonCodeTextSplitter(RecursiveCharacterTextSplitter):
     """Attempts to split the text along Python syntax."""