Use shared recent emoji reactions from account data (#5402)

* Use shared recent emoji reactions from account data

- Add `AddRecentEmoji` and `GetRecentEmojis` use cases to avoid injecting the whole `MatrixClient` for just one of these operations.
- Update the UI and logic of the emoji picker and message context menu to include the recent emojis.
- Add `CoroutineDispatchers.Default` with the defaults coroutines to use in the app for ease of use.

* Instead of replacing suggested emojis, concatenate recent ones removing duplicates

* Update screenshots

---------

Co-authored-by: ElementBot <android@element.io>

libraries/core/src/main/kotlin/io/element/android/libraries/core/coroutine/CoroutineDispatchers.kt

@@ -8,9 +8,18 @@
 package io.element.android.libraries.core.coroutine
 
 import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
 
 data class CoroutineDispatchers(
     val io: CoroutineDispatcher,
     val computation: CoroutineDispatcher,
     val main: CoroutineDispatcher,
-)
+) {
+    companion object {
+        val Default = CoroutineDispatchers(
+            io = Dispatchers.IO,
+            computation = Dispatchers.Default,
+            main = Dispatchers.Main,
+        )
+    }
+}