Add settings for "notifying" on "activity"

[carlos-zamora]

This PR implements the proposal in this comment. It adds 3 settings:

• notifyOnInactiveOutput: send a "notification"(below) of some kind when an inactive tab has new output.
• notifyOnNextPrompt: Similarly, but when we get a new prompt start (requires shell integration)
• autoDetectRunningCommand: attempt to automatically detect the progress state of this profile

For the notifyOn* settings, they take any combination of the following flags:

• tab: flash the taskbar
• audible: emit an audible bell (This will use the sounds from bellSounds, if specified)
• taskbar: display an icon in the tab (ala terminal activity indicator/alert when in background #7955 (comment) ) (basically, similar to the bell icon)
• notification: send a desktop "toast" (read: notification). Clicking that notification will focus the tab that sent it

For the autoDetectRunningCommand setting, we support:

• disabled: don't do this
• automatic: (requires shell integration) if we got a FTCS_COMMAND_EXECUTED  (133;C), then any output, set our progress state to indeterminate

Validated using this config:

"defaults":
{
	"autoDetectRunningCommand": "automatic",
	"autoMarkPrompts": true, // Needed even when your OMP config has shell integration enabled
	"rightClickContextMenu": true,
	"showMarksOnScrollbar": true
},
"list":
[
	{
		"commandline": "pwsh -nologo",
		"name": "Inactive Output",
		"notifyOnInactiveOutput":
		[
			"taskbar",
			"audible",
			"tab",
			"notification"
		]
	},
	{
		"commandline": "pwsh -nologo",
		"name": "Next Prompt",
		"notifyOnNextPrompt":
		[
			"taskbar",
			"audible",
			"tab",
			"notification"
		]
	},

• Closes terminal activity indicator/alert when in background #7955 (via notifyOnInactiveOutput)
• Closes Notification after a long running command finishes #6372 (via the notifyOnNextPrompt)
• Closes Add a "tab busy indicator" to show when a tab has belled or has output #1620 (via autoDetectRunningCommand)
• Related to Send Desktop Notification via VT Sequence (OSC777) #7718

Heavily based on #19935
Co-authored by @zadjii-msft

[carlos-zamora]

Tested this out, it's pretty cool.
Reviewed it myself and using GHCP, everything looks good.

The only thing I can think of is the possibility of adding the experimental. prefix to these settings, but even then, I don't think that necessarily does anything. Like, when would it exit experimental?

So yeah, marked this as ready for review. Enjoy y'all! 😊