WIP: Add yaml support for stub mapping configuration files

[karanjamutahi]

References

#2411

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[oleg-nenashev]

@karanjamutahi thanks! Could you please summarize how far it was reviewed during the hackfest? Maybe @Mahoney could take a look as a mntor there. Also, please register for hacktoberfest as mentioned in the PR template

[karanjamutahi]

A few questions came up mostly around the many features yaml to test for.
I need to box out some time to knock it off but there shouldn't be too much left to do.

[oleg-nenashev]

In longer run I would switch to a framework like picocli that makes it easier tmake interexchangeable configs and to embed CLI options there, but it is a good progress towards better flexibility of the code. Still needs to be taken over the line. @karanjamutahi lemme know if any help is needed

[oleg-nenashev]

@karanjamutahi Hi! It would be great to get it over the line. Let me know if I could help somehow