7097 Simplify conversion of numeric types in the message codec on iOS (cla: yes)

7098 Android embedding refactor PR1: JNI Extraction to FlutterJNI.java (cla: yes)

7102 Prepare for upcoming fuchsia vulkan driver changes (cla: yes)

7108 Fix destruction of the child object list in the iOS accessibility bridge (cla: yes)

7146 Revert “Reland “Compile libcxx and libcxxabi for Android (#6886)”” (cla: yes, size)

7151 Generalize runFromBundle to support multiple bundlePaths (cla: yes)

7152 Add native for fetching compilation trace as a memory buffer, for use in automated tools (cla: yes)

7158 Minor comments fix and add TODO (cla: yes)