feat: Forward user-registered event to Redis

[hangy]

What

Inform other systems about new users via Redis

Fixes bug(s)

• Closes Publish "user created" event - ideally after a user was fully created in Keycloak #88

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 54.43038% with 36 lines in your changes missing coverage. Please review.

Project coverage is 43.90%. Comparing base (34f07c7) to head (8df446c).

Files with missing lines	Patch %	Lines
...nfoodfacts/github/keycloak/events/RedisClient.java	55.10%	13 Missing and 9 partials ⚠️
...loak/events/RedisEventListenerProviderFactory.java	53.33%	8 Missing and 6 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #100      +/-   ##
============================================
+ Coverage     42.50%   43.90%   +1.40%     
- Complexity       51       56       +5     
============================================
  Files            17       17              
  Lines           320      369      +49     
  Branches         15       30      +15     
============================================
+ Hits            136      162      +26     
- Misses          172      184      +12     
- Partials         12       23      +11     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.