Specify you want to use a messageId as messageIdentifier

[AceTheCreator]

When using this template to generate your code, by default, it uses name as the messageIdentifier but if you use AsyncAPI v4 and above, there's already support for messageId, which means we should be able to use messageId as an identifier. So when generating your code, I suggest we add an optional additional flag that tells the generator to not use name but instead messageId.

Example @asyncapi/nodejs-template -o output -p server=production messageIdentifier=messageId

[derberg]

maybe flag should be called validation and not messageIdentifier ? and if not provided, then there is no validation?