feat: add dependencyTargets

[hannojg]

Sometimes one target needs to embedded to another target, not directly to the main app.

To achieve that the order in which we add the targets to the project is important. Thus we first need to order the tasks, so they get added in the right order in case one target has a dependency on another one.

(Note: for that to work correctly it was important to make the withXcodeProjectBeta/applyXcodeChanges actually await so they get executed after one another (which seems to be related to the intrinsics of withBaseMod).

With this, its possible to do this:

// targets/watch-app/expo-target.config.js
module.exports = {
  type: "watch",
  // ⬇️ New: Depend on another target
  dependencyTargets: ["watchcomplication"],
};

// targets/watch-complication/expo-target.config.js
module.exports = {
  type: "widget",
  name: "watchcomplication"
};

I am implementing this aiming to support watch complication widget extensions. It sill needs a bit more work, but this is a PR for that.
Partly addresses: #6