Support 'onTaskType' activation event

[alvsan09]

What it does

Provides support for onTaskType activation event

see #4199 (comment)

This brings the following benefits:

1. Activates specific plugins rather than all task provider plugins. This is achieved by presenting the 'provided' task types to the user and upon selection activate only the provider(s) for that specific selected task type.
2. The above avoids startup delays, and reduces the memory footprint on the extension host by only loading the task provider plugins which are selected.
3. Enables the use of plugins which support onTaskType e.g. 'Gulp', 'Grunt', 'Jake'.

NOTE: The above apply to extensions that have stopped using activation by the command workbench.action.tasks.runTask in favor of onTaskType activation. For backward compatibility the activation
by the command mentioned above is still supported.

Additionally, Selecting the option to configure tasks (e.g., Terminal/Configure tasks...) requires and triggers activation
of all tasks providers.

The solution introduces two pick levels for 'provided' tasks,one for the selection of the task type and the second one to resolve and show the corresponding tasks to the selected type which the user can then pick from.

The following scenarios are impacted:

1. Terminal/Run Task (for a specific task type)
   a) Long resolution (e.g., many provided tasks)
   b) quick resolution (e.g., small number of provided tasks)
2. Terminal/Configure Tasks...
3. Command palette Quick Access (e.g. ?Task)

How to test

Prerequisites:

1. Install Gulp CLI (Used by the Gulp builtin extension)

npm install gulp-cli -g

2. Install Jake CLI (Optionally, Used by the Jake builtin extension)

npm install -g jake

3. Activate Auto Detect preference for Gulp to on
   From the:
   Command palette -> type 'open user settings' -> click and then -> Navigate to (Extensions -> Gulp) and change 'Auto Detect' to 'on'

4. Activate Auto Detect preference for Jake to on
   From the:
   Command palette -> type 'open user settings' -> click and then -> Navigate to (Extensions -> Jake) and change 'Auto Detect' to 'on'

5. Use a clone of 'vscode' as the project to test theia with

gh repo clone microsoft/vscode

• edit .vscode/settings.json to delete the line:
  "gulp.autoDetect": "off"
• edit .vscode/tasks.json to remove the only "gulp" task
  this to prevent early activation of gulp.
• Copy a valid Jakefile.js under the root folder.
  Example test content:

desc('Default Task');
task('default', function () {
 console.log('Hello, Jake!');
});

desc('Test Task');
task('test', function () {
  console.log('This is a test task.');
});

Steps to test:

1. Debug theia and open the cloned vscode repository mentioned above.
2. Under the debugging IDE open the DEBUG CONSOLE using the filter load
   • Make sure that neither of the following extensions supporting onTaskType activation has been loaded/activated i.e. gulp, jake, grunt
3. On the theia instance run a gulp task i.e. Terminal / Run Task... => Select gulp => wait for it to populate the plugin provided tasks on a second quick pick and select a task to run e.g. the vscode-api-test
   • On the DEBUG CONSOLE observe that gulp was the only loaded / activated plugin.
4. If Jake was installed, test the same as above but Run a Jake task.
5. Run `Terminal/Configure tasks...
   • Configuring tasks need to activate all tasks providers, therefore grunt must have been activated with this action.
6. Run tasks via Quick Access i.e., From the command palette, type ? and then select task
   • Make sure that the two quick pick levels work for provided tasks e.g. gulp, jake (First selecting type, secondly selecting a provided task).
7. Stop Debugging and start it again to repeat the options above in different order e.g. Running Configure Task... first and then again running Quick Access first.

See test example video:
https://user-images.githubusercontent.com/76971376/232908518-580d56ce-fea2-4eac-b6ac-b018fbb33d20.mp4

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[vince-fugnitto]

The functionality looks quite good, I only have some minor comments 👍

---

I noticed some improvements that can be made in follow-up pull-requests:

• display a + Configure Task entry when no tasks are configured (above contributed items)
• add Show All Tasks... entry at the bottom of the list
• improve ordering of entries in a multiroot (sort by root then tasks)
• add Go back ↩ functionality

[vince-fugnitto]

LGTM 👍
I confirmed that:

• contributed tasks are now displayed
• contributed tasks work well, and show progress when loading (ex: gulp)
• plugins support onTaskType properly
• the quick-access menu works for tasks
• configure task... works well, and displays the loaded tasks (ex: gulp)