Increase the usefullness of 'random_password' by adding additional parameters

[roytanck]

In the wp_generate_password function, the output is run through the 'random_password' hook. This allows other functions to modify or replace the generated password. But because the $special_chars and $extra_special_chars parameters are not passed to the hook, any hooked function does not know whether special chars are allowed.

This limits the hooks usefulness, since wp_generate_password is also used to generate tokens that needs to be url-safe. By passing the two extra arguments along in the filter, hooked functions can respects these requirements.

I realize wp_generate_password is a pluggable function, but I feel that using the hook is a much cleaner way to override/improve WP's password suggestions.

[roytanck]

Patch adding $special_chars and $extra_special_chars to the 'random_password' hook.

[roytanck]

This patch adds the $length parameter too. You get the number by using mb_strlen() on the password, but simply providing it makes more sense.

[SergeyBiryukov]

In 45568:

Users: Pass $length, $special_chars, and $extra_special_chars parameters to the random_password filter in wp_generate_password().

Props roytanck.
Fixes #47092.