Create client socket early in the node startup sequence

[coot]

We should not wait for ledger to complete its startup to open a local socket.
We should investigate how local-state-query mini-protocol behaves if it takes a while
for a ledger to start, the same for chain-sync if opening consensus db takes a while.
They either error or wait until the underlying components are ready, node-to-client protocol does not use timeouts.