feat(protocol): allow override of dial func

reach/client/protocol/v1/protocol.go

@@ -16,6 +16,7 @@ const compatibleVersionConstraint = "^2.24"
 
 type Protocol struct {
 	logger logger.Logger
+	dial   protocol.DialFunc
 }
 
 // Available implements protocol.Protocol.
@@ -59,7 +60,7 @@ func (p *Protocol) Identifier() protocol.Identifier {
 
 // Operations implements protocol.Protocol.
 func (p *Protocol) Operations(addr string) protocol.Operations {
-	return &Operations{addr: addr, logger: p.logger}
+	return &Operations{addr: addr, logger: p.logger, dial: p.dial}
 }
 
 var _ protocol.Protocol = &Protocol{}