Add functions array_key_first() and array_key_last()

Hello Internals,

I'd like to ask for feedback for my idea.
Some years ago a pull request came up to add array_key_first(),
array_key_last(), and array_key_index() functions (#347
https://github.com/php/php-src/pull/347).
In the meantime a RFC was published to integrate the functions
(https://wiki.php.net/rfc/array_key_first_last_index) which was
discussed in the mailing list two and a half years ago
(https://externals.io/message/89955).

Since the pull request and the RFC doesn't sustain a real progress and
in my opinion at least the functions array_key_first(array $a) and
array_key_last(array $a) would be handy in some cases I'd like to
propose using a smaller functional scope as a first step including only
this two functions.
Additional features like returning the value of the requested element or
the function array_key_index() could be implemented in a later stage if
required.

I implemented those two functions in a different implementation approach
which tries to use as much existing code as possible available and
already created a pull request at https://github.com/php/php-src/pull/3256.

For the next steps I'd like to create a new RFC as the functional scope
differs to the existing RFC. Therefor I request a PHP.net wiki account
(wiki username: wol-soft) to create a new RFC.

Regards,
Enno

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