Migrate various function to CMake DEFER

The goal of this is to better split monolith functions like `qt6_add_qml_module` into separate components like `qt6_target_qml_sources`, `qt6_add_resources`. The idea is to delay and gather all relevant function calls, allowing for more arbitrary ordering of executions

Example

Consider this small example

qt_add_qml_module(foo
    URI Foo
)
qt_target_qml_sources(foo
    QML_FILES
        bar.qml
)
set_source_files_properties(main.qml
    PROPERTIES
        QT_RESOURCE_ALIAS Main
)

This one has unexpected failure behavior the `QT_RESOURCE_ALIAS` after it was used in `qt_target_qml_sources`. Keeping track of any such interactions would be tricky for the user, so it would be ideal to remove such interactions

Implications

• More flexibility in the allowed order of function calls
• Less need of forwarding arguments
• Lower configure time because multiple calls like `qt_add_resources` are concatenated

Functions that could be migrated

• `qt6_target_qml_sources`
• `qt6_add_resources`
• ...?