[geojson] Fix coords return type and annotate map_* callables

`coords` was annotated `Generator[tuple[float]]`, a one-element tuple,
but it yields whole coordinate tuples:

    >>> list(coords(LineString([(-115.81, 37.24), (-120.5, 40.1)])))
    [(-115.81, 37.24), (-120.5, 40.1)]
    >>> list(coords(Point((1.0, 2.0, 3.0))))
    [(1.0, 2.0, 3.0)]

Reading the second element of a 2D coordinate therefore failed with
"Tuple index out of range". Changed to `tuple[float, ...]`.

The three `map_*` functions took `Callable[[Incomplete], float |
Geometry]`, which is wrong for `map_tuples`: the implementation calls
`tuple(func(c))`, so the callable must return an iterable of floats, and
a coordinate-swapping function was rejected. Replaced the `Incomplete`
callables with the types the implementations actually use:

- `map_coords` applies `func` to individual coordinate values
  (`tuple_func` calls `func(coord[0])`, `func(coord[1])`)
- `map_tuples` applies `func` to a whole coordinate sequence and wraps
  the result with `tuple(...)`
- `map_geometries` passes each geometry through `func`

Verified against geojson 3.3.0 at runtime, and with mypy --strict.

Author: Dhairya-007

stubs/geojson/geojson/utils.pyi

@@ -1,14 +1,15 @@
-from _typeshed import Incomplete
-from collections.abc import Callable, Generator
+from collections.abc import Callable, Generator, Iterable, Sequence
 from typing import Any, Literal
 
 from geojson.base import GeoJSON
 from geojson.geometry import Geometry, LineString, Point, Polygon
 
-def coords(obj: GeoJSON | dict[str, Any]) -> Generator[tuple[float]]: ...
-def map_coords(func: Callable[[Incomplete], float | Geometry], obj: GeoJSON | dict[str, Any]) -> dict[str, Any]: ...
-def map_tuples(func: Callable[[Incomplete], float | Geometry], obj: GeoJSON | dict[str, Any]) -> dict[str, Any]: ...
-def map_geometries(func: Callable[[Incomplete], float | Geometry], obj: GeoJSON | dict[str, Any]) -> dict[str, Any]: ...
+def coords(obj: GeoJSON | dict[str, Any]) -> Generator[tuple[float, ...]]: ...
+def map_coords(func: Callable[[float], float], obj: GeoJSON | dict[str, Any]) -> dict[str, Any]: ...
+def map_tuples(func: Callable[[Sequence[float]], Iterable[float]], obj: GeoJSON | dict[str, Any]) -> dict[str, Any]: ...
+def map_geometries(
+    func: Callable[[Geometry | dict[str, Any]], Geometry | dict[str, Any]], obj: GeoJSON | dict[str, Any]
+) -> dict[str, Any]: ...
 def generate_random(
     featureType: Literal["Point", "LineString", "Polygon"],
     numberVertices: int = 3,