[TASK] Investigate ways to implement modern authentication for email in contributionsBB

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Description

Currently contributionsBB email notification uses smtp email server with username and password for authentication. This will be blocked after Aug 1st and OAuth2 protocols will be necessary. Check this link : https://answers.uillinois.edu/illinois/page.php?id=47591

Acceptance Criteria

Implementing modern authentication for email notifications

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Gmail supports OAuth2. Will need to switch from Office365 to gmail.
Useful resources for implementation are given below:
Run-through for using python library oauth2
Blog on how to send html mails with oauth2 and gmail.
Github repo for gmail oauth tools
OAuth2 documentation

Microsoft (Office365) also supports OAuth2, but it seems buggy and will need to use Azure to configure settings.
Documentation on how to authenticate SMTP application using OAuth.
Documentation on Office365 email setting using OAuth

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The current SMTP service can be used. However, will need to switch to Cloud email services later.
Since the current SMTP services will not be affected / blocked by August 1st, moving this to low priority task.

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This is kept on hold until further developments / discussions.