🧰 Changes

This splits apart some confusing work I did in httpsnippet-client-api where I was always tying the @api/<package name> to the variable name if a custom variable name was supplied. For example if you supplied an identifier of petstore and variableName of buster, the variable name would be buster but @api/<package name> would also be @api/buster. Very confusing and not really now we intend this custom variable name support to be handled.

Instead I've renamed the identifier option to the clearer packageName and added a new dedicated variableName config for custom variable names. This small refactor will require a couple small changes to @readme/oas-to-snippet.