Add request_parse_body() function

RFC: https://wiki.php.net/rfc/rfc1867-non-post

This function allows populating the $_POST and $_FILES globals for non-post
requests. This avoid

Add request_parse_body() function

RFC: https://wiki.php.net/rfc/rfc1867-non-post

This function allows populating the $_POST and $_FILES globals for non-post
requests. This avoids manual parsing of RFC1867 requests.

Fixes #55815
Closes GH-11472

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