Plain text editor implementation based on markdown input (#2840)

* Add plain text editor based on markdown input
- Fix autofocus of message composer.
- Remove `Message` data class, fetch the details in `MessagesPresenter` instead.
- Remove `enable rich text` option from advanced settings, set it as a build configuration instead.
* Fix MentionSpanProvider
* Bump RTE library to released `v2.37.3`

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

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/permalink/FakePermalinkBuilder.kt

@@ -20,9 +20,9 @@ import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.permalink.PermalinkBuilder
 
 class FakePermalinkBuilder(
-    private val result: () -> Result<String> = { Result.failure(Exception("Not implemented")) }
+    private val result: (UserId) -> Result<String> = { Result.failure(Exception("Not implemented")) }
 ) : PermalinkBuilder {
     override fun permalinkForUser(userId: UserId): Result<String> {
-        return result()
+        return result(userId)
     }
 }