Add proper berkeley interface as StackBerkeley (#63)

* switcheroo: StackBerkeley now StackGo and added proper berkeley interface as StackBerkeley

* minor nits

* remove host name resolution

* further improve API and documentation

* xnet/stack: fix a few small errors in logic

Signed-off-by: deadprogram <ron@hybridgroup.com>

* add mutex and small fix

* fix: correct checking for integer max

Signed-off-by: deadprogram <ron@hybridgroup.com>

---------

Signed-off-by: deadprogram <ron@hybridgroup.com>
Co-authored-by: deadprogram <ron@hybridgroup.com>

examples/berkeley-listener/berkeley_server.go

@@ -200,7 +200,7 @@ func run() error {
 
 	// Create blocking + Berkeley stack
 	blocking := stack.StackBlocking(5 * time.Millisecond)
-	berkeley := blocking.StackBerkeley(xnet.BerkeleyConfig{
+	berkeley := blocking.StackGo(xnet.StackGoConfig{
 		ListenerPoolConfig: xnet.TCPPoolConfig{
 			PoolSize:           flagPoolSize,
 			QueueSize:          3,

examples/min-working-example/main-mwe.go

@@ -93,7 +93,7 @@ func run(ctx context.Context, stack *xnet.StackAsync) error {
 		return fmt.Errorf("resolving router MAC: %w", err)
 	}
 	stack.SetGateway6(gateway)
-	berkstack := stack.StackBlocking(pollTime).StackBerkeley(xnet.BerkeleyConfig{
+	berkstack := stack.StackBlocking(pollTime).StackGo(xnet.StackGoConfig{
 		ListenerPoolConfig: xnet.TCPPoolConfig{
 			PoolSize:           tcpConnPoolSize,
 			QueueSize:          tcpPacketQueueSize,