[Compound] Integrate compound tokens (#586)

* Added tokens.

* Apply color to MaterialTheme, also add typography.

* Map colors to the right ones in the themes.

* Create and improve previews of some components

* More preview improvements

* Add `tertiary` and `onTertiary` colors, remove some unused ones.

* Fix usage of deleted color token

* Fix bug in Switch previews

* Create a separate `:libraries:theme` module to keep everything related to colors, typography and Compound in general.

* Fix `DatePickerPreview`

* Add missing Compound generated files by fixing their package name

* Move `ElementTheme` to the `:libraries:theme` module, make some variables internal.

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Co-authored-by: ElementBot <benoitm+elementbot@element.io>

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

@@ -26,7 +26,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.core.view.WindowCompat
-import io.element.android.libraries.designsystem.theme.ElementTheme
+import io.element.android.libraries.theme.ElementTheme
 import io.element.android.libraries.matrix.api.auth.MatrixAuthenticationService
 import io.element.android.libraries.matrix.impl.auth.RustMatrixAuthenticationService
 import io.element.android.libraries.sessionstorage.impl.memory.InMemorySessionStore