Add code-server to docker image

[phshah95]

Description

Use vscode as file browser/file editor/terminal. Get all the benefits of vscode without having to do anything.

How Has This Been Tested?

Local frontend testing. Need guidance.

Checklist (N/A)

• The PR is tagged with proper labels (bug, enhancement, feature, documentation)
• I have performed a self-review of my own code
• I have added unit tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

This is just a WIP. Looking to get some guidance on whether having something like this is even desired.
I would add:
A toggle to switch between vscode view/built-in editor
Ability to define code-server.yaml settings
Ability to define vscode settings

It looks like running code-server is an extra 200-300 MB ram for the base mage project you create when running locally.
I have not been able to test the Dockerfile change and frontend change together. The frontend change is more of a WIP/POC but I would definitely be rewriting that part.

cc:
@wangxiaoyou1993