feat: don't send core keys or haves to peers without capabilities #390
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This changes how core keys are shared and when "pre-have" messages are shared. "pre-haves" are information about which blocks (data records) a peer has, and they are used to show the user before sync starts how much data there is to sync, but we don't want to leak this data to unauthorized clients.
Currently any peer with the project key can receive keys for all cores in the project, and receive the haves for all cores in the project.
This PR makes the following changes: