[Enhancement] Add Update Connector API to Ml-commons

[Zhangxunmt]

Currently Ml-commons does not support connector update after a connector is created. If a connector has minor typo or a connector needs minor update, users would have to recreate a new connector and re-register a Model associated to it. Also sometime the connector template remain the same but users would just need to update the API_keys or some rotational information, and they would want to avoid re-creating connectors or ML models.

The Update connector API will help customers to defined and update connectors more efficiently. Also when a connector is updated, we need to both update the connector index and the memory.

It's better to have both Connector and Model Update APIs at the same time, so users will run the remote inference workflow with less obstacles.

[Zhangxunmt]

#1227