create `DSSEAttestor` interface, `payload.DSSEAttestor` implementation#1221

Merged

dekkagaijin merged 9 commits intosigstore:mainfrom dekkagaijin:merge-me-matt

Dec 16, 2021

+334-13

Commits on Dec 15, 2021

rename Signer files
Jake Sanders
committed
create DSSEAttestor interface
Jake Sanders
committed
create payload.DSSEAttestor
Jake Sanders
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consolidate Sign and PublicKey options
Jake Sanders
committed
remove pae variable
Jake Sanders
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provide payload bytes directly to signPayload
Jake Sanders
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don't inline payloadSigner
Jake Sanders
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unNeceSSarRy LeAdIng WhitESpaCe
Jake Sanders
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split signing and public key retrieval
Jake Sanders
committed