[WIP] Allow to specify module/plugin requirements in a machine-readable way

[felixfontein]

SUMMARY

This is a prototype for an action plugin that, given a list of modules/plugins, can figure out the Python and system packages that need to be installed to run these. It assumes that the module's/plugin's documentation contains a structure similar as in ansible-community/community-topics#224 (comment). I've added such information to the ufw and java_cert modules.

Ref: ansible-community/community-topics#224

ISSUE TYPE

• New Module/Plugin Pull Request

COMPONENT NAME

plugin_requirements_info action

[ansibullbot]

cc @absynth76 @ahtik @haad @ovcharenko @pyykkis
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[absynth76]

I would suggest to add an error handler to inform which module failed to run in case dependency cannot be resolve. Easily done with a block rescue pattern and a specific message on failure. My 2 cents, can be discarded if irrelevant.