add task status API

[meganrogge]

fixes #241772

[Tyriar]

These look a little mysterious to me, is this too detailed for extensions?

[meganrogge]

Not sure why we'd limit the scope for extensions when we track and find these useful internally already.

[connor4312]

I think we'd want more details docs on these and/or simpler versions for extension. Tasks do a lot of things I don't think extension authors always know about. I don't even know what half these are without reading vscode sources 😛

also -- what is the status I should look for in copilot that's emitted when a problem matcher begins/ends/has an error state? Or is that not reflected here?

[meganrogge]

I believe active and inactive do what you want, will confirm and add documentation for each type.

[meganrogge]

Active and inactive did not do what we wanted. I have added the following:

vscode/src/vscode-dts/vscode.proposed.taskStatus.d.ts

Lines 40 to 47 in 9125333

	/** Indicates that a task's problem matcher has started */
	ProblemMatcherStarted = 'problemMatcherStarted',
	/** Indicates that a task's problem matcher has ended */
	ProblemMatcherEnded = 'problemMatcherEnded',
	/** Indicates that a task's problem matcher has found errors */
	ProblemMatcherFoundErrors = 'problemMatcherFoundErrors'