Add frontend, backend & test for Resend Email feature with throttling.

[KhalidRmb]

The user can now resend the verification email upto 3 times per hour.

[KhalidRmb]

@Ram81 @RishabhJain2018 PTAL.

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This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@f59eca2). Click here to learn what that means.
The diff coverage is 44.44%.

@@            Coverage Diff            @@
##             master    #2401   +/-   ##
=========================================
  Coverage          ?   73.05%           
=========================================
  Files             ?       83           
  Lines             ?     5363           
  Branches          ?        0           
=========================================
  Hits              ?     3918           
  Misses            ?     1445           
  Partials          ?        0

Impacted Files	Coverage Δ
settings/test.py	100% <ø> (ø)
settings/common.py	100% <ø> (ø)
apps/accounts/urls.py	100% <ø> (ø)
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (ø)
apps/accounts/throttles.py	88.88% <88.88%> (ø)

Impacted Files	Coverage Δ
settings/test.py	100% <ø> (ø)
settings/common.py	100% <ø> (ø)
apps/accounts/urls.py	100% <ø> (ø)
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (ø)
apps/accounts/throttles.py	88.88% <88.88%> (ø)

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[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This pull request has been automatically closed as there is no further activity. Thank you for your contributions.