[SysUI][Floaty] Add initial delay before effects window creation

* Squeeze effect only be shown after specific duration as per UX
* Ensures that window is created only after specified delay
* This delay could further change as per feedback from UX

Bug: 399263897
Flag: com.android.systemui.shared.enable_lpp_squeeze_effect
Test: atest TopLevelWindowEffects
Change-Id: Ib7500ccda05c132f91d55abbb153506c984a2355