Extract MessageComposerContext class from MessageComposerPresenter (#876)

When sending "Composer" analytics from screens other than the composer's (e.g. send location from map) we need to know the composer's mode in order to properly fill the analytics event. `MessageComposerContext` hoists this state so that other presenters can also read it.

Related to:
https://github.com/vector-im/element-meta/issues/1674
https://github.com/vector-im/element-meta/issues/1682

features/messages/api/build.gradle.kts

@@ -25,4 +25,5 @@ android {
 dependencies {
     implementation(projects.libraries.architecture)
     implementation(projects.libraries.matrix.api)
+    api(projects.libraries.textcomposer)
 }

features/messages/api/src/main/kotlin/io/element/android/features/messages/api/MessageComposerContext.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.features.messages.api
+
+import io.element.android.libraries.textcomposer.MessageComposerMode
+
+/**
+ * Hoist-able state of the message composer.
+ *
+ * Typical use case is inside other presenters, to know if
+ * the composer is in a thread, if it's editing a message, etc.
+ */
+interface MessageComposerContext {
+    val composerMode: MessageComposerMode
+}