feat: Ability to delete account for administrators (#1874)

## Description

Add account delete option in the user account settings.

Fixes #1555 

## Type of change

- [ ] New feature (non-breaking change which adds functionality)


![image](https://user-images.githubusercontent.com/40784971/110349673-edcc5200-8058-11eb-8ded-a31d15aa0759.png)

![image](https://user-images.githubusercontent.com/40784971/110349778-0c324d80-8059-11eb-9291-abfbffedde5e.png)


## Checklist:

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Sojan Jose <sojan@pepalo.com>
Co-authored-by: Sojan Jose <sojan.official@gmail.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

spec/jobs/account/contacts_export_job_spec.rb

@@ -60,7 +60,7 @@ RSpec.describe Account::ContactsExportJob do
 
     it 'generates CSV file and attach to account' do
       mailer = double
-      allow(AdministratorNotifications::ChannelNotificationsMailer).to receive(:with).with(account: account).and_return(mailer)
+      allow(AdministratorNotifications::AccountNotificationMailer).to receive(:with).with(account: account).and_return(mailer)
       allow(mailer).to receive(:contact_export_complete)
 
       described_class.perform_now(account.id, user.id, [], {})