Fixing deserialization issues for dataclasses with subgroup fields and nested dataclasses

[zhiruiluo]

This PR is the implementation for the contribution 1 mentioned in #197.

• The default values of using add_selected_subgroups and parse_selection were set to False.
• Tests were added to verify the backward-compatiability of to_dict and from_dict.
• Added fix for issue #210
  • check whether default_factory is dataclass
  • check whether the function of partial of default_factory is dataclass
  • recursively call from_dict when either condition is true
• Questions still open to answer
  • whether check field.default for nested dataclass.

[lebrice]

Closing in favor of #233