Provide a clear communication channel for codecheckers

- Should author teams be able to provide a contact person for questions regarding the check? As a starting point, let's assume the corresponding author.
- Codecheckers should easily find the email address that can use for contacts.

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Related **user stories**:

- _As a codechecker, I want to be guided in the way that I should communicate with the author so that I do not waste time finding out email address or anonymous communication channels._
- _As the author, I want to participate in CODECHECKs in the submission and review process, so that I can improve my analysis/code._
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## Related User Stories

- **A-SO1** (direct): As an author, I want to opt in to a CODECHECK during submission and communicate with the codechecker...
- **C-CO1** (direct): As a codechecker, I want the plugin to present the appropriate communication channel...
- C-CO3 (related): As a codechecker, I want to start a discussion with the author from within OJS...
- E-SO1 (related): As a handling editor, I want to see the CODECHECK status, the discussion thread...

_User story references from the [CHECK-PUB User Stories document](https://codecheck.org.uk/pub/)._