API endpoint to enable monitoring per channel

[palango]

Abstract

Currently monitoring can only be enabled globally for all channels. We should provide a way to selectivity enable monitoring for certain channels.

Motivation

Monitoring costs fees, so the user should be able to only monitor the channels he wants to have monitoring for.

Specification

• Implement an API endpoint which allows for (dis)enabling monitoring for channels
• Write new tests cover this new endpoint.
• Create an issue in the WebUI repo to integrate this endpoint.

Part of #5011