Add in diff on resource_module for result

[jakegroves]

SUMMARY

https://github.com/ansible-collections/ansible.netcommon/blob/main/plugins/module_utils/network/common/rm_base/resource_module.py#L67 currently returns alot of information, however does not return a diff dictionary

ISSUE TYPE

• Feature Idea

COMPONENT NAME

resource_module

ADDITIONAL INFORMATION

It could be beneficial to have a diff dictionary in the result property
Otherwise every module consuming (eos,ios etc) has to create one where necessary
Can possibly do something along the lines of:

import yaml

...
            if self.commands:
                current_conf = self.get_facts(self._empty_fact_val)
                result["after"] = current_conf
                result["diff"] = dict(
                    before=yaml.safe_dump(self.before),
                    after=yaml.safe_dump(current_conf)
                )

This is based on assumptions of how resourcemodule works
Or are we expecting to implement it ourselves on local module side?