Reorganize and modlarize tests in t/primitive.t

[djerius]

This commit reorganizes and modularizes t/primitive.t, moving related tests into separate files.
It switches over to Test2::V0.

Splitting the large monolithic t/primitive.t into smaller chunks will speed up tests if parallel testing (e.g. prove -j or yath -j) harnesses are used.

[coveralls]

coverage: 28.892% (-0.02%) from 28.909% when pulling 30b43e2 on rehab_primitive-tests into 4f12de9 on master.

[zmughal]

Looks good to me. And clean!

While it does add a dependency on Test2::V0, I believe that it is widely used enough to justify using it (I use it myself). Plus modern Test-Simple uses Test2 anyway.

[djerius]

Looks good to me. And clean!

While it does add a dependency on Test2::V0, I believe that it is widely used enough to justify using it (I use it myself). Plus modern Test-Simple uses Test2 anyway.

Thanks for the review.

[zmughal]

Just to add this this, Test2::V0 will be a dual life module in Perl 5's core in the next release Perl/perl5#21481, perl5394delta.