[IS 7.0] Missing documentation on Custom outbound provisioning connectors

[JayaShakthi97]

Is your suggestion related to a missing or misleading document? Please describe.

• Documentation is missing for writing a custom outbound provisioning connector. It was available in IS 6.1 documentation (https://is.docs.wso2.com/en/6.1.0/references/extend/provisioning/write-an-outbound-provisioning-connector/)
• Custom outbound provisioning connector support has been introduced to the new Console through Custom outbound provisioning connectors cannot be selected from the new console #20222. Therefore these steps also need to be documented.