improves block functionality

adds cli compatible prompts/logs
adds logfile function for debug
adds multiselect support
new fieldRename
adds listFieldNames

util/logfile.ts

@@ -0,0 +1,15 @@
+const logFile = Deno.openSync("./log.txt", {
+  create: true,
+  write: true,
+  read: true,
+  append: true,
+});
+
+logFile.truncateSync(0);
+
+export function log(message: any) {
+  if (typeof message === "object") {
+    message = JSON.stringify(message);
+  }
+  logFile.writeSync(new TextEncoder().encode(message + "\n"));
+}