What does this PR do?(Please give us a brief description of what this PR does.)
This PR implements #599 (closed) by adding a new setting attachLdSignatureForRelays.
When enabled (default), Sharkey continues its existing behavior of attaching Linked-Data signatures to all relayed activities.
When disabled, LD signatures are never generated.
This improves privacy at the expense of increased inbound fetches and reduced relay effectiveness.
I have tested this on my own instance and seen no unexpected issues.
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