Add ignite handler to inverse transforms

[Nic-Ma]

Is your feature request related to a problem? Please describe.
I would suggest to develop a ignite handler to inverse spatial transforms, @rijobro what do you think?

follow-up of #1515

[rijobro]

Certainly sounds useful!

[Nic-Ma]

Assign to @rijobro based on our internal discussion.

Thanks.

[Nic-Ma]

Hi @rijobro ,

May I know your plan about this handler?
I received several feature request from Clara project that we want to revert spatial transforms before saving model output.
But our workflows are based on ignite, need the handler to execute the inverse logic.

Thanks.

[rijobro]

hi @Nic-Ma , I'll look into this early next week

[Nic-Ma]

Hi @rijobro ,

Thanks very much for your effort here!
As we are preparing for MONAI 0.5 release this week, is it possible to make this handler available in 0.5?

Thanks in advance.