[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>

libraries/theme/build.gradle.kts

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2022 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+    id("io.element.android-compose-library")
+    alias(libs.plugins.ksp)
+}
+
+android {
+    namespace = "io.element.android.libraries.theme"
+
+    dependencies {
+        ksp(libs.showkase.processor)
+        kspTest(libs.showkase.processor)
+
+        implementation(libs.accompanist.systemui)
+    }
+}