fix(core-api): return count of filtered peers

[dated]

The peer api currently returns the total count of all peers, instead of the count of the filtered peers, thus messing with the pagination.

It's worth noting that the schema for index currently accepts ip, status, and port as query params, yet filtering based on those values is not implemented.

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[faustbrian]

It's worth noting that the schema for index currently accepts ip, status, and port as query params, yet filtering based on those values is not implemented.

1. ip filtering would have to be something like pattern matching but could be implemented.
2. status can be removed from the schema as all peers that don't have a good status are disconnected.
3. port can be removed from the schema as a fixed port is enforced so filtering it would do nothing.

[dated]

I've left ip in the schema to be implemented in a future PR, status and port have been removed.

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