Inline Devel::Peek::Dump; allow Dump %hash etc.

This commit makes Devel::Peek::Dump modify the op tree to allow it to
dump arrays and hashes directly via Dump @array and Dump %hash.  It
also puts other operators in rvalue context, allowing the return value
of rvalue substr for instance to be dumped, making Devel::Peek more
useful as a debugging tool.

Since a future commit (to fix the rest of #78194) is likely to make
pp_entersub copy PADTMPs (operator return values) for XSUBs (it
already happens for Perl subs as of b479c9f2a), to the detriment of
Devel::Peek’s usefulness, I also made it inline Dump as a custom op.

This does introduce a backward-incompatible change, in that both argu-
ments to Dump are now in scalar context, and the number of arguments
is checked at compile time instead of run time (still run time for
&Dump(...)), but I think it is worth it.

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