Invalid URL escape "%2B"

In the last week or so the language server has stopped working for me. I connect to a desktop from my laptop using Remote SSH and do most of my development this way. Recently, the language server has been going into a crash loop with an error that looks like this:

```
panic: failed to parse request URI: parse "vscode-remote://ssh-remote%2Bwork/home/josh/work/catalyst-world": invalid URL escape "%2B"
```

Where, `ssh-remote+work` represents an SSH remote session to the `work` profile, and `/home/josh/work/catalyst-world` being the current working directory. I'm not sure if this format has changed recently, as I've successfully been using this language server for a few months now, but for one reason or another it's stopped accepting this URI format.

Any help in resolving this issue is appreciated :)

Start with the language server's request URI parsing and reproduce the crash using the reported vscode-remote:// URI containing "%2B". Done means the language server accepts this Remote SSH URI without entering a crash loop, with a regression test if the existing test structure supports it.

Written by the indexing model from the issue text.