libbinder_ndk: support handleShellCommand

At the NDK layer:
AIBinder_Class_setHandleShellCommand (to implement handleShellCommand)

At the AIDL layer:
ICInterface::dump (to override default handleShellCommand)

Test: m libbinder_ndk
Test: atest CtsNdkBinderTestCases
Test: atest libbinder_ndk_unit_test
Bug: 148692423
Change-Id: I1fec523b0ca59466d117c94243176ff123389a9a