Dataclasses for method creation

In lbmpy large dicts are created to manage all parameters for the lb method and the pystencils kernel parameters. This MR introduces dataclasses to manage all these parameters. Furthermore, a better integration with pystencils is achieved since pystencils introduced dataclasses lately.

Fixes #1 (closed)

lbmpy/creationfunctions.py

@@ -704,32 +704,30 @@ class LBMConfig:
             self.force_model = cumulant_force_model.CenteredCumulantForceModel \
                 if self.method == Method.CUMULANT else forcemodels.Guo
 
-        if self.force_model is not None and not issubclass(self.force_model, AbstractForceModel):
-            if isinstance(self.force_model, str):
-                new_force_model = ForceModel[self.force_model.upper()]
-                warnings.warn(f'ForceModel "{self.force_model}" as str is deprecated. Use {new_force_model} instead or '
-                              f'provide a class of type AbstractForceModel',
-                              category=DeprecationWarning)
-            elif isinstance(self.force_model, ForceModel):
-                new_force_model = self.force_model
-            else:
-                raise ValueError("Force model can either be provides as type of class AbstractForceModel, as type "
-                                 "of Enum ForceModel or as string")
-
-            force_model_dict = {
-                'simple': forcemodels.Simple,
-                'luo': forcemodels.Luo,
-                'guo': forcemodels.Guo,
-                'schiller': forcemodels.Guo,
-                'buick': forcemodels.Buick,
-                'silva': forcemodels.Buick,
-                'edm': forcemodels.EDM,
-                'kupershtokh': forcemodels.EDM,
-                'cumulant': cumulant_force_model.CenteredCumulantForceModel,
-                'he': forcemodels.He,
-                'shanchen': forcemodels.ShanChen
-            }
-            self.force_model = force_model_dict[new_force_model.name.lower()]
+        force_model_dict = {
+            'simple': forcemodels.Simple,
+            'luo': forcemodels.Luo,
+            'guo': forcemodels.Guo,
+            'schiller': forcemodels.Guo,
+            'buick': forcemodels.Buick,
+            'silva': forcemodels.Buick,
+            'edm': forcemodels.EDM,
+            'kupershtokh': forcemodels.EDM,
+            'cumulant': cumulant_force_model.CenteredCumulantForceModel,
+            'he': forcemodels.He,
+            'shanchen': forcemodels.ShanChen
+        }
+
+        if isinstance(self.force_model, str):
+            new_force_model = ForceModel[self.force_model.upper()]
+            warnings.warn(f'ForceModel "{self.force_model}" as str is deprecated. Use {new_force_model} instead or '
+                          f'provide a class of type AbstractForceModel',
+                          category=DeprecationWarning)
+            force_model_class = force_model_dict[new_force_model.name.lower()]
+            self.force_model = force_model_class(force=self.force)
+        elif isinstance(self.force_model, ForceModel):
+            force_model_class = force_model_dict[new_force_model.name.lower()]
+            self.force_model = force_model_class(force=self.force)
 
 
 @dataclass