[fixlib][feature] Add the source of resource kind

[aquamatthias]

Description

Add a source attribute to the kind metadata section.
Example:

[
    { "fqn": "resource", "metadata": { "source": "base" } },
    { "fqn": "instance", "metadata": { "source": "base" } }
    { "fqn": "aws_resource", "metadata": { "source": "aws" } },
    { "fqn": "aws_ec2_instance", "metadata": { "source": "aws" } }
]

To-Dos

• I have created tests for any new or updated functionality.
• I ran tox successfully.

Code of Conduct

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