add the remaining encodings submodules (#13123)

stdlib/encodings/idna.pyi

@@ -0,0 +1,26 @@
+import codecs
+import re
+from _typeshed import ReadableBuffer
+
+dots: re.Pattern[str]
+ace_prefix: bytes
+sace_prefix: str
+
+def nameprep(label: str) -> str: ...
+def ToASCII(label: str) -> bytes: ...
+def ToUnicode(label: bytes | str) -> str: ...
+
+class Codec(codecs.Codec):
+    def encode(self, input: str, errors: str = "strict") -> tuple[bytes, int]: ...
+    def decode(self, input: ReadableBuffer | str, errors: str = "strict") -> tuple[str, int]: ...
+
+class IncrementalEncoder(codecs.BufferedIncrementalEncoder):
+    def _buffer_encode(self, input: str, errors: str, final: bool) -> tuple[bytes, int]: ...
+
+class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
+    def _buffer_decode(self, input: ReadableBuffer | str, errors: str, final: bool) -> tuple[str, int]: ...
+
+class StreamWriter(Codec, codecs.StreamWriter): ...
+class StreamReader(Codec, codecs.StreamReader): ...
+
+def getregentry() -> codecs.CodecInfo: ...