feat(1645): Add step retry schema [1] #483
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Context
Sometimes users might have a flaky step or will want to retry a step on failure.
Objective
This PR adds a step retry schema.
References
screwdriver-cd/screwdriver#1645
License
I confirm that this contribution is made under the terms of the license found in the root directory of this repository's source tree and that I have the authority necessary to make this contribution on behalf of its copyright owner.