feat: impl tera-text-editor

[echl]

• Implement barebones tera-text-editor component to replace remaining uses of code-editor
• Contains pdf viewer for pdf files and rich text editor for text files
• No ability to save edits to text files yet

Screen.Recording.2023-10-20.at.5.34.01.PM.mov

Resolves #1996

[mwdchang]

@echl can you provide a few brief descriptions describing what the PR is trying to accomplish, and how to go about testing it? The issue you are pointing to isn't very helpful in terms of understanding the context.

[echl]

@echl can you provide a few brief descriptions describing what the PR is trying to accomplish, and how to go about testing it? The issue you are pointing to isn't very helpful in terms of understanding the context.

Yes, will do when pr is finalized :)