Upgrade SimpleIpV4AddressValidator and SimpleIpV6AddressValidator

Summary:
to optionally handle a CIDR or port suffix. Added capabilitiesimplemented via defaulted parameter to maintain compatibilitywith the previous version. Includes unit tests for the updated
code. Opened as a separate review per comment from Pino on review
D15093.

Part of:
CCBUG: 397572
FIXED-IN: 5.14.0

Reviewers: jgrulich, pino

Subscribers: ngraham, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D15520