Add a rate limit on the number of emails we can send from the App per user account and make it configurable

[vipulnsward]

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[gowsik-ragunath]

@vipulnsward In Miru, We have a super admin account with access to the administrator dashboard, where we can create a rate limiter page and set the number of emails that can be sent from an user account within a specific timeframe.

We can implement this rate limit check at the mailer level, as it will make it easier to log sent emails and manage the limits.

This email rate limiter will apply only to emails triggered by users and not to automated emails sent by our system.

Questions:

• What time interval should we set for resetting the email rate limit? per hour or per minute?
• What should be the default number of emails allowed within this timeframe?