Lazy load MobileTextActionsToolBar

Merged Fushan Wen requested to merge work/fuf/lazymobile into master

In most cases desktop users won't need it, and according to qmlprofiler, compiling MobileTextActionsToolBar.qml usually takes about 50~100ms depending on the hardware and disk speed. After this change, the compilation only takes 10~20ms, which should slightly speed up plasmashell startup.

@mart @ratijas @ngraham

Edited by Fushan Wen

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