Deprecate unused numba functionality

pytensor/link/numba/dispatch/basic.py

@@ -111,6 +111,10 @@ def create_numba_signature(
     reduce_to_scalar: bool = False,
 ) -> numba.types.Type:
     """Create a Numba type for the signature of an `Apply` node or `FunctionGraph`."""
+    warnings.warn(
+        "create_numba_signature is deprecated and will be removed in a future release",
+        FutureWarning,
+    )
     input_types = [
         get_numba_type(
             inp.type, force_scalar=force_scalar, reduce_to_scalar=reduce_to_scalar
@@ -138,6 +142,11 @@ def create_tuple_creator(f, n):
 
     See https://github.com/numba/numba/issues/2771#issuecomment-414358902
     """
+    warnings.warn(
+        "create_tuple_creator is deprecated and will be removed in a future release",
+        FutureWarning,
+    )
+
     assert n > 0
 
     f = numba_njit(f)

tests/link/numba/test_basic.py

@@ -319,7 +319,8 @@ def test_get_numba_type(v, expected, force_scalar, not_implemented):
     ],
 )
 def test_create_numba_signature(v, expected, force_scalar):
-    res = numba_basic.create_numba_signature(v, force_scalar=force_scalar)
+    with pytest.warns(FutureWarning, match="deprecated"):
+        res = numba_basic.create_numba_signature(v, force_scalar=force_scalar)
     assert res == expected