Cancellation token passed to resolveTask and provideTasks should not be optional

[jrieken]

vscode/src/vs/vscode.d.ts

Lines 6261 to 6283 in 57e9e1a

	export interface TaskProvider<T extends Task = Task> {
	/**
	* Provides tasks.
	* @param token A cancellation token.
	* @return an array of tasks
	*/
	provideTasks(token?: CancellationToken): ProviderResult<T[]>;
	/**
	* Resolves a task that has no [`execution`](#Task.execution) set. Tasks are
	* often created from information found in the `tasks.json`-file. Such tasks miss
	* the information on how to execute them and a task provider must fill in
	* the missing information in the `resolveTask`-method. This method will not be
	* called for tasks returned from the above `provideTasks` method since those
	* tasks are always fully resolved. A valid default implementation for the
	* `resolveTask` method is to return `undefined`.
	*
	* @param task The task to resolve.
	* @param token A cancellation token.
	* @return The resolved task
	*/
	resolveTask(task: T, token?: CancellationToken): ProviderResult<T>;
	}

In both function the cancellation token is marked as optional which makes it hard to use. We remove the question marks and always pass a token, be it default None token