feat: add horrible barely-working go ipn wasm code

cmd/hp_ssh/hp_ssh.go

@@ -0,0 +1,23 @@
+//go:build js && wasm
+
+package main
+
+import (
+	"log"
+	"syscall/js"
+
+	"github.com/tale/headplane/internal/hp_ipn"
+)
+
+func main() {
+	js.Global().Set("newIPN", js.FuncOf(func(this js.Value, args []js.Value) any {
+		if len(args) != 1 {
+			log.Fatal("Usage: newIPN(config)")
+			return nil
+		}
+
+		return hp_ipn.NewIPN(args[0])
+	}))
+
+	<-make(chan bool)
+}