fix: replace the deprecated "repl.cli" with "repl"

"REPLServer.rli" is deprecated and it's the reference of
the instance. So that we can replace the "repl.cli" with
"repl" to remove the deprecation warning in Node.js 12.

Refs: nodejs/node#26260

Author: oyyd

lib/_inspect.js

@@ -198,7 +198,7 @@ class NodeInspector {
 
   suspendReplWhile(fn) {
     if (this.repl) {
-      this.repl.rli.pause();
+      this.repl.pause();
     }
     this.stdin.pause();
     this.paused = true;
@@ -207,7 +207,7 @@ class NodeInspector {
     }).then(() => {
       this.paused = false;
       if (this.repl) {
-        this.repl.rli.resume();
+        this.repl.resume();
         this.repl.displayPrompt();
       }
       this.stdin.resume();

lib/internal/inspect_repl.js

@@ -958,38 +958,38 @@ function createRepl(inspector) {
 
       get repl() {
         // Don't display any default messages
-        const listeners = repl.rli.listeners('SIGINT').slice(0);
-        repl.rli.removeAllListeners('SIGINT');
+        const listeners = repl.listeners('SIGINT').slice(0);
+        repl.removeAllListeners('SIGINT');
 
         const oldContext = repl.context;
 
         exitDebugRepl = () => {
           // Restore all listeners
           process.nextTick(() => {
             listeners.forEach((listener) => {
-              repl.rli.on('SIGINT', listener);
+              repl.on('SIGINT', listener);
             });
           });
 
           // Exit debug repl
           repl.eval = controlEval;
 
           // Swap history
-          history.debug = repl.rli.history;
-          repl.rli.history = history.control;
+          history.debug = repl.history;
+          repl.history = history.control;
 
           repl.context = oldContext;
-          repl.rli.setPrompt('debug> ');
+          repl.setPrompt('debug> ');
           repl.displayPrompt();
 
-          repl.rli.removeListener('SIGINT', exitDebugRepl);
+          repl.removeListener('SIGINT', exitDebugRepl);
           repl.removeListener('exit', exitDebugRepl);
 
           exitDebugRepl = null;
         };
 
         // Exit debug repl on SIGINT
-        repl.rli.on('SIGINT', exitDebugRepl);
+        repl.on('SIGINT', exitDebugRepl);
 
         // Exit debug repl on repl exit
         repl.on('exit', exitDebugRepl);
@@ -999,10 +999,10 @@ function createRepl(inspector) {
         repl.context = {};
 
         // Swap history
-        history.control = repl.rli.history;
-        repl.rli.history = history.debug;
+        history.control = repl.history;
+        repl.history = history.debug;
 
-        repl.rli.setPrompt('> ');
+        repl.setPrompt('> ');
 
         print('Press Ctrl + C to leave debug repl');
         repl.displayPrompt();
@@ -1077,7 +1077,7 @@ function createRepl(inspector) {
 
     repl.defineCommand('interrupt', () => {
       // We want this for testing purposes where sending CTRL-C can be tricky.
-      repl.rli.emit('SIGINT');
+      repl.emit('SIGINT');
     });
 
     // Init once for the initial connection