Use plug-ins of extension packs for all default stacks

[benoitf]

Description

When using VS Code (or VS Code online) and when I'm working on a Java project the default java pack is proposed https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-pack

It includes vscode-java and the debugger but also a lot of other tools like the java test runner, dependency viewer, maven scaffolding, etc.

This is also true for different technologies
https://marketplace.visualstudio.com/search?target=VSCode&category=Extension%20Packs&sortBy=Installs

There are PHP pack, Python pack, TypeScript, etc.

But in Che, there is mostly only the LSP/Debug extension provided while tons of tools are de-factory really important when working on a project.

Describe the solution you'd like

I would like to have the same default plug-ins/packs provided when using Che and working for a given technology.

Java Devfile example --> Java Extension Pack being selected.
PHP Devfile example --> PHP Extension pack being selected.
etc.

dependency tasks:

• Run vsx in same container if the container specs match #15373: Merge VS Code Extensions in a single container if they're using the same container definition
• [meta.yaml / Che plug-ins]: Add dependencies section #15376: [meta.yaml / Che plug-ins]: Add dependencies section
• Add type “Che plugin pack” in plug-in broker #15377 : Add type “Che plugin pack” in plug-in broker

Check plug-ins are working tasks:

• Check extensions of VS Code extension pack are running smoothly #15390: Check VS Code extension pack extensions

[tsmaeder]

This is a good idea, but we don't have the notion of "extension packs" for Che plugins. This needs some technical thought.
Also, this sounds largish; should it be included in the roadmap? https://github.com/eclipse/che/wiki/Roadmap

[benoitf]

AFAIK it's largish as it's an epic

[tsmaeder]

Since the implementation of this is unclear, not sure which team to assign this to. @benoitf @l0rd this needs some discussion first.

[tsmaeder]

Removed from language backlog, not clear this falls into our responsibilities.