Refactor: rewrote Japanese natural language processing code imported from server_editor.py

The logic has not been changed, only renaming, splitting and moving modules on a per-function basis.
Existing code will be left in place for the time being to avoid breaking the training code, which is not subject to refactoring this time.

style_bert_vits2/utils/stdout_wrapper.py

@@ -0,0 +1,47 @@
+import sys
+import tempfile
+from typing import TextIO
+
+
+class StdoutWrapper(TextIO):
+    """
+    `sys.stdout` wrapper for both Google Colab and local environment.
+    """
+
+
+    def __init__(self) -> None:
+        self.temp_file = tempfile.NamedTemporaryFile(
+            mode="w+", delete=False, encoding="utf-8"
+        )
+        self.original_stdout = sys.stdout
+
+
+    def write(self, message: str) -> int:
+        result = self.temp_file.write(message)
+        self.temp_file.flush()
+        print(message, end="", file=self.original_stdout)
+        return result
+
+
+    def flush(self) -> None:
+        self.temp_file.flush()
+
+
+    def read(self, n: int = -1) -> str:
+        self.temp_file.seek(0)
+        return self.temp_file.read(n)
+
+
+    def close(self) -> None:
+        self.temp_file.close()
+
+
+    def fileno(self) -> int:
+        return self.temp_file.fileno()
+
+
+try:
+    import google.colab  # type: ignore
+    SAFE_STDOUT = StdoutWrapper()
+except ImportError:
+    SAFE_STDOUT = sys.stdout