So it seems that there is a need to get more compiler warnings from qmllint. With the compiler category, one already gets a lot of the warnings that the compiler emits, but it seems that some compiler warnings are only emitted by the compiler and not by qmllint.
Implement the missing compiler warnings in qmllint.

One example of such a warning happens when using import QtQuick.Controls instead of import QtQuick.Controls.Basic:
Cannot generate efficient code for call to untyped JavaScript function
and
'PageIndicator' is used but it is not resolved [unresolved-type]

I guess that all the other Cannot generate efficient code for warnings are required too.

The main reason for this is to make sure that compiled bindings stay compiled via qmllint. Currently there is no way to avoid "regressions" where compilable code get uncompilable because somebody changed it, except for doing weird stuff on the aotstats to detect such regressions.