Changes to Import mutable skills into selected Agents.

the skills/items response property's maxLength was increased from 32 to 63 for the response status 200

the skills/items response's property pattern was changed from ^[a-z0-9]([-a-z0-9]*[a-z0-9])?$ to ^[a-z0-9]+(-[a-z0-9]+)*$ for the status 200

endpoint added