[Message Actions] Add emoji reactions option (#568)

* Add logic to send message reactions

* Add emoji library, create EmojiPicker component

* Fix bottom sheet behaviors

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

app/src/main/kotlin/io/element/android/x/initializer/EmojiInitializer.kt

@@ -0,0 +1,29 @@
+/*
+ * 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.
+ */
+
+package io.element.android.x.initializer
+
+import androidx.startup.Initializer
+import com.vanniktech.emoji.EmojiManager
+import com.vanniktech.emoji.google.GoogleEmojiProvider
+
+class EmojiInitializer : Initializer<Unit> {
+    override fun create(context: android.content.Context) {
+        EmojiManager.install(GoogleEmojiProvider())
+    }
+
+    override fun dependencies(): MutableList<Class<out Initializer<*>>> = mutableListOf()
+}