Add a Microsoft 365 Graph Email Backend

[Luke-Sanborn]

This pull request adds an email backend using the Microsoft Authentication Library (MSAL). Microsoft 365 is phasing out Basic SMTP authentication. This will allow GeoNode users that uses Microsoft 365 to continue using email notifications within GeoNode.

This PR is mostly a rework of an existing pull request #12907

Checklist

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[cla-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have the users @Luke-Sanborn on file. In order for us to review and merge your code, please contact the project maintainers to get yourself added.

[gemini-code-assist]

Code Review

This pull request introduces a new Django email backend, MicrosoftGraphEmailBackend, to send emails via the Microsoft Graph sendMail API, along with configuration options, documentation, and unit tests. The review feedback highlights several critical improvements: parsing the bare email address from mail_from to prevent invalid API URLs when a display name is present, enhancing the _send method to support HTML alternatives, attachments, and custom headers, fixing the saveToSentItems parameter to be a boolean, and utilizing requests.Session to reuse connections and reduce latency when sending multiple emails.

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[cla-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have the users @Luke-Sanborn on file. In order for us to review and merge your code, please contact the project maintainers to get yourself added.

[cla-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have the users @Luke-Sanborn on file. In order for us to review and merge your code, please contact the project maintainers to get yourself added.

[giohappy]

hi @Luke-Sanborn did you consider my comment #12907 (comment) ?