Add stubs for python-datemath

stubs/python-datemath/METADATA.toml

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+version = "1.5.*"
+# Requires a version of arrow with a `py.typed` file
+requires = ["arrow>=1.0.1"]

stubs/python-datemath/datemath/__init__.pyi

@@ -0,0 +1,12 @@
+from datetime import datetime
+
+import arrow
+
+from .helpers import DateMathException as DateMathException, parse as parse
+
+def dm(
+    expr: str, *, now: arrow.Arrow | None = ..., tz: str = ..., type: str | None = ..., roundDown: bool = ...
+) -> arrow.Arrow: ...
+def datemath(
+    expr: str, *, now: arrow.Arrow | None = ..., tz: str = ..., type: str | None = ..., roundDown: bool = ...
+) -> datetime: ...

stubs/python-datemath/datemath/helpers.pyi

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+from _typeshed import Incomplete
+
+import arrow
+
+class DateMathException(Exception): ...
+
+def parse(
+    expression: str, now: arrow.Arrow | None = ..., tz: str = ..., type: str | None = ..., roundDown: bool = ...
+) -> arrow.Arrow: ...
+def __getattr__(name: str) -> Incomplete: ...