Add ability to detect that SIM import is in progress

SIM import might be long running so things may need to be updated
when it starts rather then when it completes.

Test
See Iae69fe2d96bae6d268f77515ca85eb572c2dfe9b

Bug 31781331
Change-Id: I9efdb181b97f3fdf49cd31ba5d3eae43bcad674c