Soften runtime requirement for Android SwipeRefreshLayout

[freakboy3742]

What is the problem or limitation you are having?

The Android backend currently requires that androidx.swiperefreshlayout:swiperefreshlayout:1.1.0 be available as a runtime dependency, even if you're not using the DetailedList widget where it is used.

Describe the solution you'd like

Briefcase now allows for end-user customisation of gradle dependencies. The dependency on SwipeRefreshLayout should only be required if you actually use the DetailedList widget. If you don't, an app should run without this dependency being declared.

Describe alternatives you've considered

Do nothing. Apps will continue to work; there's just an extra dependency that isn't used.

Additional context

Three changes are required:

1. Catch an ImportError related to importing SwipeRefreshLayout in DetailedList if the package isn't available.
2. Raise an error in the DetailedList `create() method if the import wasn't successful
3. Add note in the DetailedList documentation notes section, that clarifies the required dependency.

The implementation of MapView will be a useful point of comparison - it has ImportError handling when OSMMapView isn't available, raises an error if MapView is used when OSMMapView isn't available, and has documentation describing the required dependency

[gwen-sarapata]

I'll take a look at this at PyCon US 2024

[mhsmith]

Fixed by #2595.