Add global context.cacheDir provider. (#1606)

## Type of change

- [ ] Feature
- [ ] Bugfix
- [x] Technical
- [ ] Other :

## Content

Dagger now provides the app's `cacheDir` when requesting a `@CacheDirectory File`  type.

## Motivation and context

To support some upcoming code that needs the `cacheDir` to be changed during tests.

samples/minimal/src/main/kotlin/io/element/android/samples/minimal/MainActivity.kt

@@ -49,8 +49,8 @@ class MainActivity : ComponentActivity() {
             sessionStore = sessionStore,
             userAgentProvider = userAgentProvider,
             rustMatrixClientFactory = RustMatrixClientFactory(
-                context = applicationContext,
                 baseDirectory = baseDirectory,
+                cacheDirectory = applicationContext.cacheDir,
                 appCoroutineScope = Singleton.appScope,
                 coroutineDispatchers = Singleton.coroutineDispatchers,
                 sessionStore = sessionStore,