POC: Minimal example of actions API

[susnux]

This is a minimal example how an API could look like to register actions for the Activity sidebar.
For example it could be used to register the comment input action on the activity tab.

See code or this example how the usage would look like:

/**
 * Dummy example of how to add a sidebar action
 */
window.OCA.Activity.registerSidebarAction({
	mount: (el) => {
		// eslint-disable-next-line no-console
		console.log('Register example plugin')
		const label = document.createElement('label')
		label.innerText = 'Write a comment'
		label.appendChild(document.createElement('input'))
		label.appendChild(document.createElement('hr'))
		label.style.display = 'flex'
		label.style.flexDirection = 'column'
		el.appendChild(label)
	},
	// eslint-disable-next-line no-console
	unmount: () => console.log('unregister example plugin'),
})

window.OCA.Activity.registerAction('comments', {
	label: 'Delete comment',
	handler: (activity) => console.log(activity),
})

This example looks bad, because no styling is done but it works:

Of cause you could simply mount the comment app's input component, no big adjustments needed.

[susnux]

See nextcloud/server#41483 for comments part

[susnux]

Closed in favor of #1416

[github-actions]

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