Add domain option for tunnel creation

[glxgxr]

Since April 2023 it is possible to configure the domain option on tunnel creation with the ngrok client, so that you are able to use the free domain (without having to pay for a static subdomain). This merge request makes it possible to use it, otherwise it would just be ignored.

Reference:
https://ngrok.com/blog-post/new-ngrok-domains
https://ngrok.com/docs/secure-tunnels/ngrok-agent/reference/ngrok/#flags-12

[coffeduong]

@glxgxr I've tried apply your code in utils.js but it still random domain. I think it need to change other places too.
About document, we should update more in Options section, set domain in example code will make easier for understand.

[glxgxr]

@coffeduong What options did you use to initiate the tunnel? I am using

        const conf = {
            domain: "xxx.ngrok-free.app",
            region: "eu",
            addr: "3007",
            authtoken: "xxx"
        };

and it works fine.

Update: I'll update the documentation with an example to make it a little bit clearer.

[coffeduong]

@glxgxr @bubenshchykov the code is working, please merge it for the community

[pschild]

Hi,
Very interested in this🔥Are there any plans when this PR is going to be merged? 😃
Thanks!

[glxgxr]

@philnash Any chances in merging this pull request? I think this could be very helpful for many services that use this package. 🙂

[shamoons]

Would love to have this in

[tnarik]

please, @bubenshchykov , merge this, as it is a very simple change that mostly just add the new additional option supported by the actual ngrok client to this library. Patching a local version of ngrok is trivial, but it would be so much better if it gets officially supported.

[bubenshchykov]

better later than never! :) merged... now trying to restore my npm access to publish, cc @philnash in case you can publish sooner