Allow specifying the bind address in the config file

[dongresource]

• Should the HTTP and HTTPS endpoints always share a bind address or should they be separately configurable?
• Should the bind_ip and port configurations be unified into a single field?
• Should the default be changed to 0.0.0.0 or should it stay as localhost?
• Should there be a default value or should the absence of the field be an error?

[yungcomputerchair]

• I think it would make sense to have the bind address be separately configurable for HTTP and HTTPS. You can just add the bind_ip field to the TlsConfig as well so it mirrors what you have now in CoreConfig.
• nah, the port is used separately in the code so the port and bind IP should be separate fields
• I'm not an expert on this one, I thought there was a good security reason for having it be localhost instead of 0.0.0.0 but I can't recall what it is
• since port is optional, we should either make the bind IP optional as well with a localhost or 0.0.0.0 fallback OR make the port a required value as well. I think the latter would be Bad™️ to do for config backcompat. So probably make the IP optional.