Remove global config for dataclass_wizard (#36)

In working on the yaml configuration files in neural-lam I realised that
setting global configuration for `dataclass_wizard` is a very bad idea. This
should be obvious because different uses of `dataclass_wizard` might have
different needs for configuration, however previously I didn't realise how to
set the config when using `dataclass_wizard.YAMLWizard`. It turns out the key
is to 1) also inherit from `dataclass_wizard.JSONWizard` (and make this the
primary parent class) and 2) use `dataclass_wizard.JSONWizard.Meta` to define
the config (not `dataclass_wizard.YAMLWizard.Meta` since this class does not
exist).

This commit removes the global config for `dataclass_wizard` and only sets the
configuration on `mllam-data-preps` `mllam_data_prep.config.Config` config
dataclass.

mllam_data_prep/config.py

@@ -9,18 +9,6 @@ class InvalidConfigException(Exception):
     pass
 
 
-class GlobalJSONMeta(JSONWizard.Meta):
-    """
-    Global settings for the JSON load/dump process, that should apply to
-    *all* subclasses of `JSONWizard`.
-
-    Note: it does not matter where this class is defined, as long as it's
-    declared before any methods in `JSONWizard` are called.
-    """
-
-    raise_on_unknown_json_key = True
-
-
 @dataclass
 class Range:
     """
@@ -275,7 +263,7 @@ class Output:
 
 
 @dataclass
-class Config(dataclass_wizard.YAMLWizard):
+class Config(dataclass_wizard.JSONWizard, dataclass_wizard.YAMLWizard):
     """Configuration for the model.
 
     Attributes:
@@ -305,6 +293,9 @@ class Config(dataclass_wizard.YAMLWizard):
     schema_version: str
     dataset_version: str
 
+    class _(JSONWizard.Meta):
+        raise_on_unknown_json_key = True
+
 
 if __name__ == "__main__":
     import argparse