[IDEA] Add ability to set response code in Custom Authenticator scenario

[psapozh]

Is your feature request related to a problem? Please describe.
At this time Mirth Connect in Http Listener/Custom Authentication class (com.mirth.connect.plugins.httpauth.Authenticator) does not allow me to set any other response code other than 401. After pulling the code, I saw that 401 is hard coded for FAIL and CHALLENGE cases. There's no variable to use to set it to a different value.

Describe your use case
We are developing custom authentication class that will verify jwt token using issuer and audience. This part works well I am able to do that. But we have a requirement that when token is expired mirth should respond with 403 in this specific case. The 401 case will be valid in other scenarios. For that reason I am asking for that value to be settable in code in my extending class.

Describe the solution you'd like
When creating an instance of com.mirth.connect.plugins.httpauth.AuthenticationResult I would like to be able to set response code that I want to use.

Describe alternatives you've considered
It is not ideal because we really like the idea of custom interceptor class, the other solution is to use a filter inside a channel. This will let me set custom response code but it is not ideal.

Additional context
Related: #4159 #4725

[psapozh]

Hello tagging here @twest-mirthconnect and @cturczynskyj as requested.