bug#63671: Add function to test equality of hash tables

[Ihor Radchenko]

Joseph Turner via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@gnu.org> writes:

>> The standard library must be generally useful with clear semantics.
>
> Would extending `equal' to handle hash tables be generally useful?

See https://yhetil.org/emacs-devel/871qvz4kdw.fsf@localhost/

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