CMake: Deprecate some android public APIs

Deprecate usage of:
 - qt_android_add_apk_target
 - qt_android_apply_arch_suffix
 - qt_android_generate_deployment_settings

when used by user projects directly. Instead, projects should use
qt_add_executable / qt_add_library.

Show a deprecation warning when the commands are used directly.
The deprecation warnings can be silenced using cmake's
-Wno-deprecated command line option.

To detect non-direct usage from inside our own function
implementations, we set some target properties which are then read to
decide whether to show the message.

Pick-to: 6.5
Fixes: QTBUG-108508
Change-Id: Ib039cc5f3a01c2276173abb1e43f4eed216d0170
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>

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