Replace FormulaEngine subclasses with type aliases

This improves type compliance for that type.

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

src/frequenz/sdk/timeseries/formula_engine/__init__.py

@@ -4,35 +4,14 @@
 """Deprecated Formula Engine."""
 
 
-from typing_extensions import deprecated
+from typing_extensions import TypeAlias
 
 from .._base_types import QuantityT
 from ..formulas._formula import Formula
 from ..formulas._formula_3_phase import Formula3Phase
 
-
-@deprecated(
-    "The FormulaEngine class is deprecated and will be removed in a future release. "
-    + "Please use the Formula class instead."
-)
-class FormulaEngine(Formula[QuantityT]):
-    """Deprecated Formula Engine class.
-
-    This class is deprecated and will be removed in a future release.
-    Please use the `Formula` and `Formula3Phase` classes directly.
-    """
-
-
-@deprecated(
-    "The FormulaEngine3Phase class is deprecated and will be removed in a future release. "
-    + "Please use the Formula3Phase class instead."
-)
-class FormulaEngine3Phase(Formula3Phase[QuantityT]):
-    """Deprecated FormulaEngine3Phase class.
-
-    This class is deprecated and will be removed in a future release.
-    Please use the `Formula3Phase` class directly.
-    """
+FormulaEngine: TypeAlias = Formula[QuantityT]
+FormulaEngine3Phase: TypeAlias = Formula3Phase[QuantityT]
 
 
 __all__ = ["FormulaEngine", "FormulaEngine3Phase"]