Implement vscode navigateBack, navigateForward, and navigateToLastEditLocation commands

[danieltomasku]

Signed-off-by: Daniel Ku daniel.ku@ericsson.com

What it does

This PR maps the VS Code commands navigateBack, navigateForward, and navigateToLastEditLocation to their respective Theia commands. Closes #8956

How to test

1. Install the Back & Forth extension
2. Open some files and navigate around a codebase
3. Use the back and forward buttons in the editor tabbar
4. Confirm that the back and forward buttons are working as expected

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the review guidelines

[colin-grant-work]

With the caveat of #8955 - opening any file, no matter how it's done, whether through code navigation or workspace search, always adds the first line to the navigation stack - this works for me, and appears to be consistent with how other VSCode commands are mapped to Theia commands. 👍

[vince-fugnitto]

The changes look good to me 👍

[vince-fugnitto]

@danieltomasku do you need help with merging? :)