RT-84272 Translate test_requires() to TEST_REQUIRES

[kevindawson]

RT-84272: https://rt.cpan.org/Public/Bug/Display.html?id=84272

Since 6.63_03 ExtUtils::MakeMaker accepts TEST_REQUIRES parameters to dump into META spec 2.0. It would be nice if Module::Install can be upgraded to translate test_requires() into that, as the documentation has been written in the first place.

This is my first stab to implement that, while some of the tests are failing because the test was expecting it to be merged with build_requires, or include() logic might have to be updated to reflect the change as well. Which I haven't got around to it yet. https://gist.github.com/miyagawa/5261788

Would be nice if someone can take a look and continue over to make it happen.

[kevindawson]

I have been having a hack around with this :)
see: https://github.com/kevindawson/Module-Install/tree/RT-84272

O what fun the logic is, still coming to terms