Annotated float scheme

Added a annotated translation scheme as described in #470 (closed) + some refactoring.

Depends on !827 (merged).

saqc/core/translation/__init__.py

@@ -5,11 +5,8 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 # -*- coding: utf-8 -*-
-from saqc.core.translation.basescheme import (
-    FloatScheme,
-    MappingScheme,
-    TranslationScheme,
-)
+from saqc.core.translation.basescheme import MappingScheme, TranslationScheme
 from saqc.core.translation.dmpscheme import DmpScheme
+from saqc.core.translation.floatscheme import AnnotatedFloatScheme, FloatScheme
 from saqc.core.translation.positionalscheme import PositionalScheme
 from saqc.core.translation.simplescheme import SimpleScheme