Move cli to internal

internal/cli/cli.go

@@ -0,0 +1,10 @@
+package cli
+
+import "github.com/alecthomas/kong"
+
+type CLI struct {
+	GenerateSecret GenerateSecret   `kong:"cmd,help='Generate new proxy secret'"`
+	Access         Access           `kong:"cmd,help='Print access information.'"`
+	Run            Proxy            `kong:"cmd,help='Run proxy.'"`
+	Version        kong.VersionFlag `kong:"help='Print version.',short='v'"`
+}