Investigate delivering of Theia plugins with data containers

[garagatyi]

Description

Workspace next walking skeleton #10123 requires a way of delivering IDE files into a workspace, so IDE could plug them in on a workspace start.
Delivering files with Docker/k8s exec API is considered but there is another idea of using containers that don't run any process but gets injected into a workspace to deliver binaries.
We need to know how to do it on k8s/Docker and what are the implications.

Reproduction Steps

OS and version:

Diagnostics:

[garagatyi]

Current plugin broker flow uses another flow with delivering image by the broker. Closing since this issue is not actual anymore