doc: notation Inspect Command line Spec - Phase 2

[vaninrao10]

What is the areas you would like to add the new feature to?

Notation CLI

Is your feature request related to a problem?

The feature is linked to the Phase 1 of the Notation inspect Command https://github.com/notaryproject/notation/pull/500#discussion_r1068076457

What solution do you propose?

1. Add ability for notation inspect to inspect a specific signature. Customer may be interested in only one signature after running notation list, especially when there are lots of signatures associated with the artifact.

As per Yi Maybe it is more intuitive to introduce a flag later for single signature

notation inspect --signature

What alternatives have you considered?

Notation Inspect spec is taken iterative approach for multiple scenarios. As of now Notation inspect command will have the ability to inspect all the signatures associated with signed artifact.

Any additional context?

No response