Fix for symlinks bug

[armartinez]

Description

Update to CEWorkspaceFile and CEWorkspaceFileManager to support symlinks. It separates the id from the url on CEWorkspace file so there can be different files pointing to the same file url, similar to how Visual Studio Code handles symlinks.

Related Issues

closes #1839

Checklist

• [x] I read and understood the contributing guide as well as the code of conduct
• [x] The issues this PR addresses are related to each other
• [x] My changes generate no new warnings
• [x] My code builds and runs on my machine
• [x] My changes are all related to the related issue above
• [x] I documented my code

Screenshots

[itjustcrashed]

This fixes #1839, correct?

[austincondiff]

Where are we with this? Are we close?

[armartinez]

@austincondiff I've updated the PR so it ready for another round of reviews