Add stubs for datauri

stubs/datauri/METADATA.toml

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+version = "1.1.*"
+upstream_repository = "https://github.com/eclecticiq/python-data-uri"

stubs/datauri/datauri/__init__.pyi

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+from .datauri import DataURIError as DataURIError, discover as discover, parse as parse

stubs/datauri/datauri/datauri.pyi

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+from collections.abc import Generator
+from re import Pattern
+from typing import Final
+
+RE_DATA_URI: Final[Pattern[str]]  # undocumented
+
+class DataURIError(ValueError): ...
+
+class ParsedDataURI:
+    media_type: str | None
+    data: bytes
+    uri: str
+
+    def __init__(self, media_type: str | None, data: bytes, uri: str) -> None: ...
+    def __eq__(self, other: object) -> bool: ...
+    def __hash__(self) -> int: ...
+
+def parse(uri: str) -> ParsedDataURI: ...
+def discover(s: str) -> Generator[ParsedDataURI]: ...