feat(notification): important events notifications

[james-d-elliott]

This sends notifications to users when they add devices.

[authelia]

Artifacts

These changes are published for testing on Buildkite, DockerHub and GitHub Container Registry.

Docker Container

• docker pull authelia/authelia:feat-notify-users
• docker pull ghcr.io/authelia/authelia:feat-notify-users

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[codecov]

Codecov Report

Merging #4644 (fb4cb78) into master (1c3f650) will increase coverage by 0.20%.
The diff coverage is 72.91%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4644      +/-   ##
==========================================
+ Coverage   67.30%   67.50%   +0.20%     
==========================================
  Files         266      266              
  Lines       19049    19124      +75     
  Branches      431      431              
==========================================
+ Hits        12820    12910      +90     
+ Misses       5482     5464      -18     
- Partials      747      750       +3     

Flag	Coverage Δ
backend	67.92% <72.91%> (+0.17%)	⬆️
frontend	62.65% <ø> (+0.43%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/handlers/handler_register_webauthn.go	0.00% <0.00%> (ø)
internal/notification/smtp_auth.go	11.42% <0.00%> (ø)
internal/handlers/handler_register_totp.go	62.85% <33.33%> (-1.04%)	⬇️
internal/handlers/util.go	74.46% <64.70%> (-25.54%)	⬇️
internal/templates/provider.go	46.66% <66.66%> (ø)
internal/handlers/handler_reset_password_step2.go	50.00% <80.00%> (+2.17%)	⬆️
internal/templates/funcs.go	82.19% <97.61%> (+14.86%)	⬆️
internal/ntp/util.go	76.92% <0.00%> (-7.70%)	⬇️
internal/server/handlers.go	92.85% <0.00%> (+1.07%)	⬆️
...oginPortal/SecondFactor/PushNotificationMethod.tsx	68.70% <0.00%> (+6.87%)	⬆️
... and 1 more