Move ElementCall Component to the rust based call view model

locales/en/app.json

@@ -58,6 +58,18 @@
   },
   "developer_mode": {
     "always_show_iphone_earpiece": "Show iPhone earpiece option on all platforms",
+    "callViewModelImplementation": {
+      "forced": "Your deployment pins the call implementation.",
+      "matrix_js_sdk": {
+        "description": "The MatrixRTC session of matrix-js-sdk carries the call, as before",
+        "label": "matrix-js-sdk"
+      },
+      "matrix_rtc": {
+        "description": "The Rust matrix-rtc crate carries the call through the host's drivers",
+        "label": "matrix-rtc (Rust)"
+      },
+      "title": "Call implementation"
+    },
     "crypto_version": "Crypto version: {{version}}",
     "custom_livekit_url": {
       "current_url": "Currently set to: ",