feat: Implement ngrok v1 proxy for serve command (#4)

## Description
I implemented the integration with [ngrok
v1](https://github.com/inconshreveable/ngrok) as one of the integrations
for the Tunnel feature.
This feature uses ngrok to tunnel the URL passed to the serve command,
and sets the ngrok URL as the endpoint URL for the LIFF app.

Below is what the terminal looks like when the command is executed:
```
❯ npx @line/liff-cli serve -l 1234567890-aBcDeFg -u http://127.0.0.1:8081 --proxy-type ngrok-v1 --ngrok-command ngrok
Successfully updated endpoint url for LIFF ID: 1234567890-aBcDeFg.

→  LIFF URL:     https://liff.line.me/1234567890-aBcDeFg
→  Proxy server: https://abc123.ngrok.example.com/
```


In order for users to use this feature, they need to install `node-pty`.
`node-pty` is a large package.
ref: https://bundlephobia.com/package/[email protected]

Because not all users will use the ngrok v1 integration feature, I
specified it in `peerDependencies`.

package.json

@@ -38,6 +38,7 @@
     "eslint": "8.50.0",
     "eslint-config-prettier": "9.1.0",
     "msw": "2.3.1",
+    "node-pty": "1.0.0",
     "prettier": "3.3.1",
     "publint": "0.2.8",
     "typescript": "5.4.5",
@@ -48,6 +49,15 @@
     "conf": "12.0.0",
     "http-proxy": "1.18.1",
     "inquirer": "9.2.23",
-    "picocolors": "1.1.0"
+    "picocolors": "1.1.0",
+    "strip-ansi": "7.1.0"
+  },
+  "peerDependencies": {
+    "node-pty": "^1.0.0"
+  },
+  "peerDependenciesMeta": {
+    "node-pty": {
+      "optional": true
+    }
   }
 }

src/serve/commands/index.test.ts

@@ -19,7 +19,9 @@ describe("serveCommand", () => {
       url: "https://example.com?hoge=fuga",
       host: "https://example.com",
       port: "8000",
+      proxyType: "local-proxy",
       localProxyPort: "9001",
+      ngrokCommand: "ngrok",
       inspect: true,
     };
 
@@ -45,6 +47,10 @@ describe("serveCommand", () => {
       "--local-proxy-port",
       options.localProxyPort,
       "--inspect",
+      "--proxy-type",
+      options.proxyType,
+      "--ngrok-command",
+      options.ngrokCommand,
     ]);
 
     expect(serveAction).toHaveBeenCalledWith(options, proxy);

src/serve/commands/index.ts

@@ -1,7 +1,6 @@
 import { Command } from "commander";
-import { LocalProxy } from "../proxy/local-proxy.js";
-import path from "path";
 import { serveAction } from "../serveAction.js";
+import { resolveProxy } from "../resolveProxy.js";
 
 export const installServeCommands = (program: Command) => {
   const serve = program.command("serve");
@@ -18,18 +17,23 @@ export const installServeCommands = (program: Command) => {
       "-i, --inspect",
       "The flag indicates LIFF app starts on debug mode. (default: false)",
     )
+    .option(
+      "--proxy-type <proxyType>",
+      "The type of proxy to use. local-proxy or ngrok-v1",
+      "local-proxy",
+    )
     .option(
       "--local-proxy-port <localProxyPort>",
       "The port number of the application proxy server to listen on when running the CLI.",
       "9000",
     )
+    .option(
+      "--ngrok-command <ngrokCommand>",
+      "The command to run ngrok.",
+      "ngrok",
+    )
     .action(async (options) => {
-      const cwd = process.cwd();
-      const proxy = new LocalProxy({
-        keyPath: path.resolve(cwd, "localhost-key.pem"),
-        certPath: path.resolve(cwd, "localhost.pem"),
-        port: options.localProxyPort,
-      });
+      const proxy = resolveProxy(options);
       await serveAction(options, proxy);
     });
   return serve;