Start a relay-mode proxy from a configuration file, mirroring
StartProxy.
dirOrFile may be a directory or a file path:
Directory: looks for kaven-relay-proxy.config inside it, writing a
default DEFAULT_RELAY_PROXY_CONFIG the first time so it can be
edited, then loads it.
Start a relay-mode proxy from a configuration file, mirroring StartProxy.
dirOrFilemay be a directory or a file path:kaven-relay-proxy.configinside it, writing a default DEFAULT_RELAY_PROXY_CONFIG the first time so it can be edited, then loads it.The loaded IRelayProxyConfig is resolved into IStartRelayProxyOptions via ResolveRelayProxyConfig and passed to StartRelayProxyCore.