Add function that exposes removeAllPendingNotificationRequests

[ohkhan]

At the moment the method for cancelling all notifications involves also clearing notifications that have been pushed.
Current implementation for reference:

flutter_local_notifications/flutter_local_notifications/macos/flutter_local_notifications/Sources/flutter_local_notifications/FlutterLocalNotificationsPlugin.swift

Lines 370 to 384 in 8839a00

	func cancelAll(_ result: @escaping FlutterResult) {
	if #available(macOS 10.14, *) {
	let center = UNUserNotificationCenter.current()
	center.removeAllPendingNotificationRequests()
	center.removeAllDeliveredNotifications()
	result(nil)
	} else {
	let center = NSUserNotificationCenter.default
	for scheduledNotification in center.scheduledNotifications {
	center.removeScheduledNotification(scheduledNotification)
	}
	center.removeAllDeliveredNotifications()
	result(nil)
	}
	}

In order to avoid canceling pushed notifications one has to use a persistent solution to track notification IDs and delivery times in order to know which ids can be cancelled. It would be great if we could simply expose a function that exclusively calls removeAllPendingNotificationRequests.

[MaikuB]

Can you submit a PR for this?

[TaeBbong]

I've submit PR #2639 for this issue. Would you mind to check this? @MaikuB @ohkhan

[MaikuB]

Will do, I approved the run already so that at least you can see if any checks fail

[MaikuB]

Closing this as #2639 has been merged