Add setting to allow access to registration page for non-logged-in users

[jeffpaul]

Is your enhancement related to a problem? Please describe.

Currently, when Restricted Site Access is enabled, all front-end pages including the user registration page are restricted based on the plugin’s access rules. This prevents new users from registering when the site is under restriction.

To improve flexibility, introduce a new setting (default: disabled) that allows administrators to permit access to the registration page (/wp-login.php?action=register or a custom registration URL) for any user who is not logged in.

Designs

Potential code snippet from @dkotter to consider:

add_filter(
	'restricted_site_access_is_restricted',
	function ( $is_restricted, $wp ) {
		if ( ! empty( $wp->request ) && 'wp-signup.php' === $wp->request ) {
			$is_restricted = false;
		}
		return $is_restricted;
	},
	10,
	2
);

Describe alternatives you've considered

No response

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