Spotify Example

[danthorpe]

This PR adds an example application, built using swift-networking and swift-composable-loadable. It showcases the following approach:

1. Imports Networking, NetworkingClient and NetworkingClientLive
   • Ideally, in a production app only the final app target would depend on NetworkingClientLive
2. Creates a new dependency using @DependencyClient for a SpotifyClient.
3. The Spotify.Client separates the "Spotify API" aspect from the networking by making use of Spotify.api static value.
   • This uses @Dependency(\.networkClient) as its starting point, before adding Spotify related configuration.
   • This configuration includes setting up OAuth parameters using a Spotify App which I've already created - although this is still in development mode.
4. The Spotify.Client provides an API to perform actions such as sign in, sign out, listen for credentials changing, setting existing credentials, as well as fetching resources such as the user profile.
5. The app is built using TCA, and the AppFeature handles sign in/out & credentials.
6. Once signed in, the app will show the user's followed artists. This is done using Loadable and Paginating components from swift-composable-loadable.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.06%. Comparing base (930dc0c) to head (cadb49a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #101   +/-   ##
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  Coverage   82.05%   82.06%           
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  Files          92       92           
  Lines        2012     2013    +1     
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+ Hits         1651     1652    +1     
  Misses        361      361           

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