Remove obsolete code in converters

src/property_utils/units/converters.py

@@ -16,40 +16,6 @@
     ExponentiatedPhysicalPropertyUnitConverter,
     CompositePhysicalPropertyUnitConverter,
 )
-from property_utils.exceptions.units.converters import (
-    InvalidUnitConversion,
-    UndefinedConverter,
-)
-
-_converters: dict[GenericUnitDescriptor, Type["PhysicalPropertyUnitConverter"]] = {}
-
-
-def get_converter(
-    generic: GenericUnitDescriptor,
-) -> Type["PhysicalPropertyUnitConverter"]:
-    """
-    Get converter for given generic descriptor.
-    """
-    try:
-        return _converters[generic]
-    except KeyError as exc:
-        raise UndefinedConverter(
-            f"a converter has not been defined for {generic}"
-        ) from exc
-
-
-def register_converter(generic: GenericUnitDescriptor):
-    """
-    Decorate a converter class to register the generic descriptor of the units it
-    operates on.
-    """
-
-    def wrapper(cls):
-        _converters[generic] = cls
-        cls.generic_unit_descriptor = generic
-        return cls
-
-    return wrapper
 
 
 class UnitPrefix(float, Enum):