Use flagged-respawn to respawn Node.js cleanly for near repl

This also enables user to pass desired Node.js/V8 flags

bin/near

@@ -1,4 +1,11 @@
-#!/bin/sh
-CLI_PATH="$(dirname "$0")"/near-cli.js
-node --experimental-repl-await "$CLI_PATH" "$@"
-
+#!/usr/bin/env node
+const flaggedRespawn = require('flagged-respawn');
+require('v8flags')((e, flags) => {
+    if (e) {
+        throw e;
+    }
+    flaggedRespawn(
+        flags.concat(['--experimental_repl_await']),
+        process.argv.indexOf('repl') == -1 ? process.argv : process.argv.concat(['--experimental-repl-await']),
+        ready => ready && require('./near-cli.js'));
+})

package.json

@@ -22,8 +22,7 @@
   },
   "homepage": "https://github.com/nearprotocol/near-shell#readme",
   "bin": {
-    "near": "./bin/near",
-    "near-cli.js": "./bin/near-cli.js"
+    "near": "./bin/near"
   },
   "devDependencies": {
     "eslint": "^6.4.0",
@@ -36,12 +35,14 @@
     "bn": "^1.0.5",
     "bs58": "^4.0.1",
     "chalk": "^3.0.0",
+    "flagged-respawn": "^1.0.1",
     "is-ci": "^2.0.0",
     "jest-environment-node": "^24.5.0",
     "ncp": "^2.0.0",
     "nearlib": "^0.20.0",
     "rimraf": "^3.0.0",
     "update-notifier": "^4.0.0",
+    "v8flags": "^3.1.3",
     "yargs": "^15.0.1"
   },
   "keywords": [