Feature release (minor)

Added

• Added support for PHP 8.0

Changed

• The maximum key length of memcached is 250. The storage capabilities provided 255 which will lead to errors when keys up to this length would've been used.
• The capabilities of this storage now contain dynamic key lengths as whenever the namespace or namespaceSeparator is changed, the maximum key length will change as well as the namespace prefix will reserve some space in the cache key.