Rewrite resource loading mechanism

[jrodbx]

During our hack week, we used com.android.ide.common.resources.deprecated.ResourceRepository mainly due its simplicity -- pass it a file path to a resource source set directory, and it will parse and load the contents for later retrieval and resolution for free. However, this left a bit of tech debt.

First, this ResourceRepository definition has since been deleted from sdk-common and replaced with a different interface implemented in the Android Studio project. As a result, we can't bump some of LayoutLib's transitive dependencies (sdk-common, layoutlib-api).

Second, this also couples us slightly to AGP's merged resources dir, which contains all the transitive resources that drive Paparazzi. Following the new ResourceRepository approach would instead reference and parse the project resource files in /src/main/res (and variants), artifact resource files in aar/res, as well as the framework resources, provided by layoutlib, directly.

Since Paparazzi tests should also run on the CLI, the new ResourceRepository implementation cannot use a similar approach and use Intellij's PSI model to reference the resource source set directories. Instead, the implementation would likely have to rely on AGP bits to obtain them (heads up, Bazel folk, this would be another thing to implements) which is still better than coupling to AGP's intermediary output directories.

Fixing this should automatically also provide support for application modules (since we wouldn't be looking into build/intermediates/merged_res anymore, which is in a binary format for application modules) and fix the issue with HTML string resources since a different resource parsing path is used altogether.

I've been putting this off for a while, but it's about time to tackle this since we'll be rewriting/refactoring the core of Paparazzi on the march to 2.0.

[jrodbx]

This should now be fixed, and will be promoted in the upcoming (1.3.1) release.

[jisungbin]

Thanks for the awesome work! 🫶🫶 (@jrodbx @kevinzheng-ap and other Paparazzi contributors!)