Add logic layer for the ACL firewall rules management.

client/internal/firewall.go

@@ -0,0 +1,14 @@
+//go:build !linux
+
+package internal
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/netbirdio/netbird/client/firewall"
+)
+
+func buildFirewallManager() (fw firewall.Manager, err error) {
+	return nil, fmt.Errorf("not implemented for this OS: %s", runtime.GOOS)
+}