Notification automation

[Zakarialabib]

This issue is dedicated to Email & Notifications thru the app.

Notifying customers & admins is essential. In the settings section, we should be able to activate the automation option of notification or email, as well as having a button to manually send emails.

PaymentPurchase Mail => send to admin mail
PaymentReturn Mail => send to admin and customer mail
PaymentSale Mail=> send to customer and admin mail
Purchase Mail=> send to admin mail
Quotation Mail=> send to customer and admin mail
Return Sale Mail => send to admin mail
Return Purchase Mail => send to admin mail
Sale Mail => send to customer and admin mail
Marketing Mail => select products to send promotion mail to customers
Report Mail => sending overview report to admin