[Rich text editor] Add full screen mode (#1447)

- Add full screen mode for the rich text editor (RTE). When text formatting options are enabled, the editor can be dragged to full screen.
- Remove `ConstraintLayout` from `textcomposer` module, now made much simpler now the RTE supports being called in multiple layouts matrix-org/matrix-rich-text-editor#822

- Part of vector-im/element-meta#1973
- Includes design from #1315
- Fixes #1293 (through new layout)
- Fixes #1394 (through inclusion of matrix-org/matrix-rich-text-editor#824)
- Fixes #1259 (through inclusion of matrix-org/matrix-rich-text-editor#820)

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

libraries/textcomposer/impl/src/main/kotlin/io/element/android/libraries/textcomposer/components/TextInputRoundedCornerShape.kt

@@ -0,0 +1,48 @@
+/*
+ * 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.libraries.textcomposer.components
+
+import androidx.compose.animation.core.animateDpAsState
+import androidx.compose.animation.core.tween
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.unit.dp
+import io.element.android.libraries.designsystem.text.applyScaleUp
+import io.element.android.libraries.textcomposer.MessageComposerMode
+
+@Composable
+internal fun textInputRoundedCornerShape(
+    composerMode: MessageComposerMode,
+): RoundedCornerShape {
+    val roundCornerSmall = 20.dp.applyScaleUp()
+    val roundCornerLarge = 21.dp.applyScaleUp()
+
+    val roundedCornerSize = if (composerMode is MessageComposerMode.Special) {
+        roundCornerSmall
+    } else {
+        roundCornerLarge
+    }
+
+    val roundedCornerSizeState = animateDpAsState(
+        targetValue = roundedCornerSize,
+        animationSpec = tween(
+            durationMillis = 100,
+        ),
+        label = "roundedCornerSizeAnimation"
+    )
+    return RoundedCornerShape(roundedCornerSizeState.value)
+}