[IMP] mail : add mixin to normalize email address

This Mixin can be used to store a normalized version of the primary
email address of the parent model. The email_normalized field can
than be used on that model to search quickly on emails (by simple
comparison and not using time consuming regex anymore)

This commit will be usefull to simplify the email address comparison
in the blacklist mixin but also for any models storing non normalized
email address.

Task ID : 1896677

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