Open room member avatar in a media viewer (#1911)

* Open room member avatar in viewer.

The `MediaViewer` was extracted to its own library module.

* Update screenshots

* Restore KSP processor in `:libraries:mediaviewer:api`, this should generate Showkase components again.

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

libraries/mediaviewer/test/build.gradle.kts

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2023 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")
+}
+
+android {
+    namespace = "io.element.android.libraries.mediaviewer.test"
+}
+
+dependencies {
+    api(projects.libraries.mediaviewer.impl)
+    implementation(projects.libraries.core)
+    implementation(projects.tests.testutils)
+    implementation(projects.libraries.matrix.api)
+}