Add jsonnet stubs (#14253)

stubs/jsonnet/METADATA.toml

@@ -0,0 +1,2 @@
+version = "0.21.*"
+upstream_repository = "https://github.com/google/jsonnet"

stubs/jsonnet/_jsonnet.pyi

@@ -0,0 +1,35 @@
+from collections.abc import Callable
+from typing import Final
+
+# Gleaned from https://github.com/google/jsonnet/blob/master/python/_jsonnet.c
+version: Final[str]
+
+def evaluate_file(
+    filename: str,
+    jpathdir: str | list[str] | None = ...,
+    max_stack: int = 500,
+    gc_min_objects: int = 1000,
+    gc_growth_trigger: float = 2,
+    ext_vars: dict[str, str] | None = ...,
+    ext_codes: dict[str, str] | None = ...,
+    tla_vars: dict[str, str] | None = ...,
+    tla_codes: dict[str, str] | None = ...,
+    max_trace: int = 20,
+    import_callback: Callable[[str, str], tuple[str, object | None]] = ...,
+    native_callbacks: dict[str, tuple[tuple[str, ...], Callable[..., object]]] | None = ...,
+) -> str: ...
+def evaluate_snippet(
+    filename: str,
+    src: str,
+    jpathdir: str | list[str] | None = ...,
+    max_stack: int = 500,
+    gc_min_objects: int = 1000,
+    gc_growth_trigger: float = 2,
+    ext_vars: dict[str, str] | None = ...,
+    ext_codes: dict[str, str] | None = ...,
+    tla_vars: dict[str, str] | None = ...,
+    tla_codes: dict[str, str] | None = ...,
+    max_trace: int = 20,
+    import_callback: Callable[[str, str], tuple[str, object | None]] = ...,
+    native_callbacks: dict[str, tuple[tuple[str, ...], Callable[..., object]]] | None = ...,
+) -> str: ...