feat: hide author email address via flag

[PKief]

Add a new flag which allows to hide the email addresses for authors.

This PR resolves #246.

[adamdehaven]

The code here lgtm; although, it feels like this privacy-first option should be the default rather than opt-in

[pi0]

Thanks!

[pi0]

Regarding privacy, emails are always persisted in git commits, we are not exposing that is not already public.

Github allows <username>@users.noreply.github.com (or <id>+<username>@users.noreply.github.com when privacy enabled) to be used instead of real email.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.05%. Comparing base (0914fd7) to head (d619a18).
Report is 55 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #247       +/-   ##
===========================================
- Coverage   69.10%   45.05%   -24.06%     
===========================================
  Files           9       12        +3     
  Lines         916      950       +34     
  Branches       85       95       +10     
===========================================
- Hits          633      428      -205     
- Misses        283      519      +236     
- Partials        0        3        +3     

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