Translation cleanups

A number of cleanups and disentanglements to the current translator implementations:

• Extract a real abstract Translator interface
• Remove the mapping based approach from the FloatTranslator to make it actually accept floating point values unequal exact integers

saqc/core/translation/basescheme.py

@@ -22,14 +22,14 @@ from saqc.lib.types import ExternalFlag, PandasLike
 ForwardMap = Dict[ExternalFlag, float]
 BackwardMap = Dict[float, ExternalFlag]
 
-class TranslationScheme:
 
+class TranslationScheme:
     @abstractmethod
     def __call__(self, ExternalFlag) -> float:
         pass
 
     @abstractmethod
-    def forward(self, PandasLike) -> Flags:
+    def forward(self, pd.DataFrame | DictOfSeries) -> Flags:
         pass
 
     @abstractmethod