implement spyOnProperty

[phra]

Do you want to request a feature or report a bug?

FEATURE

What is the current behavior?

at the moment it's impossible to spy on a getter/setter due to the way the patching is done.
in jasmine they have implemented a special method called spyOnProperty to manage this use case.

What is the expected behavior?

spyOnProperty is implemented also in jest.

related to firebase/firebase-admin-node#160

[ratheeshinfy]

use below syntax to invoke observer from spec file
component.searchForm.controls['your_input'].setValue('test')

[github-actions]

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