Add SMTP Configuration and Notification Mailers

[emmabjj]

Related tickets: #41 / #325 / #98 / #97

Add smtp configuration, ensuring the email system in local development uses the the local file system and doesn't require network access for automated testing and development purposes.

Mailers added:

• Add mailer for new evaluation invitations and resend invitation
• Add mailer to notify for a role request change after an evaluation invitation
• Add mailer for recusal
• Add mailer for new evaluation assignments and reassignments

Functionality included:

• Email recipient is able to click on the "Login to Challenge.gov" button and redirected to challenge.gov.
• The recusal mailer is sent to a challenge manager and has a link to the submission details page of the submission the evaluator recused themselves from.
• The evaluation assignment mailer is sent to the evaluator and has a link to the submission new evaluation page.
• The email is sent from [email protected] so that an evaluator can respond to the email if they need to request a role change.
• The evaluation invitation mailer is sent when the invitation is resent from evaluators management by a challenge manager.
• The evaluation assignment mailer is sent to the evaluator when a challenge manager reassigns them to a submission.

Something to note/Questions/Food for thought:

• There can be more than one challenge manager assigned to a challenge, but the phase doesn't scope challenge managers, i.e. all phases include all the challenge managers in that challenge. The notification mailers include all challenge manager names and emails if there is more than one challenge manager assigned to that challenge. When an evaluator recuses themselves from a submission, all challenge managers for that challenge are included as recipients for that recusal mailer.
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[stepchud]

wow very nice, I have very little code review feedback. will do some testing now.

[stepchud]

looks good to me 🎸

hold on I just saw an exception

[stepchud]

all good, just had to restart my server