Easy delivery and implementation for Language Servers plugins

[slemeur]

Description

The goal of this epic is to work on the packaging and the implementation of Language Servers plugins inside of Che in order to make them easier to deliver and easier to update.
We also want to run LS as sidecars containers to the workspace - so that the IDE tooling run into its own set of containers, without affecting the application stack defined by the end-user.

Today:

• an LS plugin consistent of an Agent that is installed inside of a workspace's machine. When the LS agent is injected in the workspace's machine, it alters/changed the dependencies that are installed in the workspace's machine.
• a LS is having a lifecycle that is associated to the Che releases and versions

The goal of the epic are the following:

• A LS plugin can have its own lifecycle (decoupled from Che versions)
• A LS plugin can be delivered as a independent container
• A LS plugin run as a sidecar container to the workspace

Sub-tasks

• Document Language Servers delivery mechanism Language Servers delivery mechanism #7554

Linked issues

#6149
#5623

[slemeur]

Will be fixed by #8265