[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/build.gradle.kts

@@ -32,8 +32,6 @@ dependencies {
     implementation(projects.libraries.matrixui)
     implementation(projects.libraries.designsystem)
     implementation(projects.libraries.testtags)
-    implementation(libs.androidx.constraintlayout)
-    implementation(libs.androidx.constraintlayout.compose)
 
     implementation(libs.matrix.richtexteditor)
     api(libs.matrix.richtexteditor.compose)