Add stubs for chevron package (#7139)

Co-authored-by: Akuli <akuviljanen17@gmail.com>

stubs/chevron/METADATA.toml

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+version = "0.14.*"

stubs/chevron/chevron/__init__.pyi

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+from .main import cli_main as cli_main, main as main
+from .renderer import render as render
+from .tokenizer import ChevronError as ChevronError
+
+__all__ = ["main", "render", "cli_main", "ChevronError"]

stubs/chevron/chevron/main.pyi

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+from _typeshed import StrOrBytesPath
+from typing import Any
+
+_OpenFile = StrOrBytesPath | int
+
+def main(template: _OpenFile, data: _OpenFile | None = ..., **kwargs: Any) -> str: ...
+def cli_main() -> None: ...

stubs/chevron/chevron/metadata.pyi

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+version: str

stubs/chevron/chevron/renderer.pyi

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+from _typeshed import StrPath, SupportsRead
+from typing import Any, MutableSequence, Sequence
+
+g_token_cache: dict[str, list[tuple[str, str]]]  # undocumented
+
+def render(
+    template: SupportsRead[str] | str | Sequence[tuple[str, str]] = ...,
+    data: dict[str, Any] = ...,
+    partials_path: StrPath | None = ...,
+    partials_ext: str = ...,
+    partials_dict: dict[str, str] = ...,
+    padding: str = ...,
+    def_ldel: str | None = ...,
+    def_rdel: str | None = ...,
+    scopes: MutableSequence[int] | None = ...,
+    warn: bool = ...,
+) -> str: ...

stubs/chevron/chevron/tokenizer.pyi

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+from typing import Iterator
+
+class ChevronError(SyntaxError): ...
+
+def grab_literal(template: str, l_del: str | None) -> tuple[str, str]: ...  # undocumented
+def l_sa_check(template: str, literal: str, is_standalone: bool) -> bool | None: ...  # undocumented
+def r_sa_check(template: str, tag_type: str, is_standalone: bool) -> bool: ...  # undocumented
+def parse_tag(template: str, l_del: str | None, r_del: str | None) -> tuple[tuple[str, str], str]: ...  # undocumented
+def tokenize(
+    template: str, def_ldel: str | None = ..., def_rdel: str | None = ...
+) -> Iterator[tuple[str, str]]: ...  # undocumented