Add allocation tests for ruby2_keywords

This tests ruby2_keywords flagged methods, as well as passing
ruby2_keywords flagged hashes to other methods.

Some of the behavior here is questionable, such as allocating
different numbers of objects depending on whether a block is
passed or whether YJIT is enabled. I think there are likely ways
to eliminate allocations in certain cases.  However, this gives
us a baseline and shows us where it is possible to make
improvements.

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