Fixes #367

Unnecessary try/catch?

Increase page size in PagingSample

Fixes #325

AndroidX Transition 1.2.0 is required for apps that target API 29 or higher and AndroidX Transition 1.3.0 is needed to take full advantage of the changes in Fragment 1.2.0.

Test: ./run_all_tests.sh

Instead of requiring `RedditActivity` to save and restore the selected subreddit, use `SavedStateHandle` and `AbstractSavedStateViewModelFactory` in `SubRedditViewModel` to allow the ViewModel to save and restore its own saved instance state.

Test: ./run_all_tests.sh
Test: ran PagingWithNetworkSample

- Activity 1.0.0 -> 1.1.0
- Fragment 1.2.0-rc05 -> 1.2.0
- Lifecycle 2.2.0-rc03 -> 2.2.0
- Navigation 2.2.0-rc04 -> 2.2.0

Test: ./run_all_tests.sh

Removes Network Paging sample from CI

Sort the dependencies alphabetically to make it more consistent when adding new dependencies.

Test: ./run_all_tests.sh

Make it more clear that each artifact group is independent from one another.

Test: ./run_all_tests.sh

Remove the overly broad "support" version and instead provide a separate, explicit version for each group of artifacts.

Test: ./run_all_tests.sh

Test: ./run_all_tests.sh

Use its replacement, `androidx.test.ext.junit.runners.AndroidJUnit4` from the `androidx.test.ext:junit` dependency.

Test: ./run_all_tests.sh

Instead of requiring each Fragment to redirect `findNavController()` through a `navController()` method that can be overridden in tests, use `Navigation.setViewNavController()` to control what NavController is found by `findNavController()`, allowing us to remove the `@OpenForTesting` annotation on each Fragment and the `navController()` method.

Test: Ran the GithubBrowserSample

[Fragment `1.1.0`](https://developer.android.com/jetpack/androidx/releases/fragment#version_110_3) added support for `postponeEnterTransition()` with a timeout, allowing us to avoid needing to directly use `postDelayed`.

Test: Ran the GithubBrowserSample

Test: ./run_all_tests.sh

Test: ./run_all_tests.sh

The stated purpose of onActivityCreated() is to wait until the activity is created. That isn't needed here, where what we're actually doing is setting up the binding with the ViewModel, making this more suitable for onViewCreated(). As onActivityCreated() and onViewCreated() happen back to back, there's no actual difference in behavior (just increased clarity on what we're doing).

Provide type safety to map and switchMap methods by using the respective Kotlin extension methods rather than Transformations.map and Transformations.switchMap.

Test: Ran the GithubBrowserSample

Update UserActivity.java

more efficient way of sorting repos

Avoid references to the Fragment's Views after onDestroyView()

After onDestroyView() runs, Fragment's Views are eligible for garbage collection. Ensure that we don't hold onto any references after onDestroyView() to allow for the Views to be garbage collected as soon as possible.

For the GithubBrowserSample, this required changing the AutoClearedValue class to clear the backing field when the Fragment's view is destroyed, rather than wait for the Fragment itself to be destroyed.

Test: ./run_all_tests.sh

Fix Lint issues

Fix many of the common Lint issues found across the repository.

Test: ./run_all_tests.sh

Upgrade AGP, Jetpack versions

Upgrade to the latest releases:

- Android Gradle Plugin 3.5.3
- Activity 1.0.0
- Arch Core 2.1.0
- Core-ktx 1.1.0
- Fragment 1.2.0-rc05
- Lifecycle 2.2.0-rc03
- Navigation 2.2.0-rc04
- Room 2.2.3
- Work 2.2.0

Fixes Lint issues where observe() was incorrectly being used with `this` instead of `getViewLifecycleOwner()`.

Fixed usage of the deprecated `getSupportLoaderManager()` to use `LoaderManager.getInstance(this)`.

Test: ./run_all_tests.sh

Minor fix for unused variable in test

Enable new benchmark reporting for non-canary users

Update benchmark to 1.0.0 stable

Remove local snapshot path that was accidentally committed

Fix scroll offset in paging sample