Add block status input arg

[Kay-Zee]

Works towards: https://github.com/onflow/flow/issues/392

Description

One possible solution for #392

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For contributor use:

• [x] Targeted PR against master branch
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [ ] Added appropriate labels

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[turbolent]

agreed with @janezpodhostnik, maybe add an enum?

[psiemens]

Is this PR still in progress @Kay-Zee?

[Kay-Zee]

not sure if this is still the solution we'd like to go with for solving #392

Any objections here?