[Setup] Add ArcGISToolkit dependency

[yo1995]

This PR removes the local ArcGIS Swift package from the project, and add local ArcGISToolkit to the project.

Also, it includes a sample that demonstrate the toolkit capability, to verify the dependency is correctly set up.

This PR will close this card: https://github.com/ArcGIS/arcgis-runtime-samples-swift/projects/1#card-80396669

[yo1995]

I make this URL the public URL when it goes live, so that we don't need to revisit the README at that time. Now it shows 404.

[dfeinzimer]

I placed an API key into AppSecrets.swift.masque and verified that it's getting picked up by logging String.licenseKey but I'm not getting a map to successfully display in the "Display a map" sample.

If I add ArcGISRuntimeEnvironment.apiKey = APIKey("…") to SamplesApp.init() which is similar to what the toolkit does, I get a map to display successfully.

Is there anything I'm missing?

[yo1995]

I placed an API key into AppSecrets.swift.masque and verified that it's getting picked up by logging String.licenseKey but I'm not getting a map to successfully display in the "Display a map" sample.

If I add ArcGISRuntimeEnvironment.apiKey = APIKey("…") to SamplesApp.init() which is similar to what the toolkit does, I get a map to display successfully.

Is there anything I'm missing?

Oops sorry. Please refer to the root README about API key setup: https://github.com/ArcGIS/arcgis-runtime-samples-swift/tree/v.next#configuring-api-keys basically we put the key in a separate hidden file .secrets in the root directory and exclude it from the source control.