ext/curl: Add `CURLOPT_PREREQFUNCTION` (#13255)

Curl >= 7.80.0 supports declaring a function for `CURLOPT_PREREQFUNCTION` option
that gets called after Curl establishes a connection (inc

ext/curl: Add `CURLOPT_PREREQFUNCTION` (#13255)

Curl >= 7.80.0 supports declaring a function for `CURLOPT_PREREQFUNCTION` option
that gets called after Curl establishes a connection (including the TLS handshake
for HTTPS connections), but before the actual request is made.

The callable must return either `CURL_PREREQFUNC_OK` or `CURL_PREREQFUNC_ABORT` to
allow or abort the request.

This adds support for it to PHP with required ifdef.

- libc: https://curl.se/libcurl/c/CURLOPT_PREREQFUNCTION.html

Co-authored-by: Gina Peter Bnayard <girgias@php.net>

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