Warn when wp transient list is used with external object cache

[danielbachhuber]

Fixes#61

$ wp transient list +---------------------------------+------------------------------------------+------------+ | name | value | expiration | +---------------------------------+------------------------------------------+------------+ | doing_cron | 1677266261.8137209415435791015625 | false | | health-check-site-status-result |{"good":16,"recommended":4,"critical":1} | false | +---------------------------------+------------------------------------------+------------+ $ wp plugin install --activate wp-redis Installing WP Redis (1.3.2) Downloading installation package from https://downloads.wordpress.org/plugin/wp-redis.1.3.2.zip... The authenticity of wp-redis.1.3.2.zip could not be verified as no signature was found. Unpacking the package... Installing the plugin... Plugin installed successfully. Activating 'wp-redis'... Plugin 'wp-redis' activated. Success: Installed 1 of 1 plugins. $ wp redis enable Success: Enabled WP Redis by creating wp-content/object-cache.php symlink. $ wp transient list Warning: Transients are stored in an external object cache, and this command only shows those stored in the database. +---------------------------------+------------------------------------------+------------+ | name | value | expiration | +---------------------------------+------------------------------------------+------------+ | health-check-site-status-result |{"good":16,"recommended":4,"critical":1} | false | +---------------------------------+------------------------------------------+------------+