Issue 234 redis cache

[StephanHCB]

Description

• introduces go-autumn-sync with both inmemory and redis option
• use go-autumn-kafka (sarama wrapper) instead of kgo, more flexible, more standardised and offers better debugging. This also adds Azure Event Hub support

Closes #234

Checklist

• I have read the CONTRIBUTING.md
• I have made corresponding changes to the documentation
• My changes generate no lint errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Only MIT licensed or MIT license compatible dependencies are used (e.g.: Apache2 or BSD)
• The code contains no credentials, personalized data or company secrets

[StephanHCB]

Tip: read the commit messages first, I've grouped my changes.

The total diff touches many files just because the cache now is a repository instead of a service (which it should honestly have always been).

[codecov]

Codecov Report

Attention: 163 lines in your changes are missing coverage. Please review.

Comparison is base (98d71b4) 61.08% compared to head (accbcee) 60.43%.

Files	Patch %	Lines
internal/repository/kafka/kafka.go	0.00%	55 Missing ⚠️
internal/repository/cache/lowlevel.go	40.29%	33 Missing and 7 partials ⚠️
internal/repository/cache/cache.go	58.00%	20 Missing and 1 partial ⚠️
internal/service/services/services.go	33.33%	8 Missing and 2 partials ⚠️
internal/service/repositories/repositories.go	40.00%	6 Missing and 3 partials ⚠️
internal/service/updater/repositories.go	43.75%	6 Missing and 3 partials ⚠️
internal/service/owners/owners.go	53.84%	4 Missing and 2 partials ⚠️
internal/repository/config/accessors.go	33.33%	4 Missing ⚠️
internal/service/updater/owners.go	25.00%	2 Missing and 1 partial ⚠️
internal/service/updater/services.go	25.00%	2 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
- Coverage   61.08%   60.43%   -0.66%     
==========================================
  Files          50       49       -1     
  Lines        5250     5181      -69     
==========================================
- Hits         3207     3131      -76     
+ Misses       1821     1809      -12     
- Partials      222      241      +19     

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