fix: ensure x-app-uuid is present when using token

[mble-sfdc]

The AppLink control plane requires this header to be present as part of validations, so lets ensure it is present.

Additionally, lets set a valid User-Agent header to indicate this is from the SDK.

Ref: W-18723611

[ekozilforce]

Nit: we should be able to use fs to load package.json and get the version from there.

[mble-sfdc]

This bends my brain a bit - just using something like:

    const pjson = fs.readFileSync(path.join(__dirname, "..", "package.json"), "utf8");
    const pkg = JSON.parse(pjson);

    const defaultOpts = {
      headers: {  
        "User-Agent": `heroku-applink-node-sdk/${pkg.version}`,
      },
    };

[mble-sfdc]

Ah, I forget __dirname isn't available in modules and have to do some hackery.

[ekozilforce]

Curious, why use a branded type?

[mble-sfdc]

This is a Go habit of declaring "this thing really is a UUID instead of literally any string"

[ekozilforce]

Thank you for catching and fixing 🙇

[ekozilforce]

@brahyt-sf the test failures here look similar to the ones we are addressing in #36. I'm thinking since they are only failing on ubuntu we should go ahead and merge then try to resolve in the pr you have open. Wdyt?

[brahyt-sf]

@brahyt-sf the test failures here look similar to the ones we are addressing in #36. I'm thinking since they are only failing on ubuntu we should go ahead and merge then try to resolve in the pr you have open. Wdyt?

@ekozilforce Yeah we can try that, I will address this failure in that PR. I also wanted to address some other things in that PR, its mistakenly Open and not in Draft.