Chore: standardize whitespace (4 spaces, trim trailing)

[mikeseese]

This is an optional PR that standardizes the whitespace in the repo.

• Converts tabs to 4 spaces (given the existing setting in .vscode/settings.json)
• Adds a setting to automatically trim trailing whitespace on save
• Trims existing trailing whitespace
• I saw some misaligned code in language-server/src/server.ts was aligned properly

Feel free to reject this one. This can cause quite a bit of merge conflicts, but it seems like this repo isn't active right now so it may be a good time to merge it. This was only 10 minutes of work so no hard feelings if you don't want to take it.

[Lucas7211]

Looks good, but I think you shouldn't be formatting package-lock.json, since it's automatically generated by npm and will just get reverted back next time it gets updated.

[mikeseese]

package-lock.json indentation mimics the indentation of package.json. I tested this with a simple setup in an empty directory:

1. npm init
2. Change indentation to tabs
3. npm install uuid
4. See package-lock.json has tabs
5. Change indentation of package.json to 4 spaces
6. npm install
7. See package-lock.json has 4 spaces

With that said, you're right, package-lock.json is automatically generated, so I ran npm install in the root directory, in ./extension, and in ./language-server with Node v18.13.0 (latest LTS) and NPM v9.4.0 (latest version) and committed any changes to this branch as is with no post-formatting. The only change seemed to be in the root package-lock.json with the updated version and it seems some missing dev: true (probably due to an update of npm)