Initialize offset in ConsumerGroup reconciler

[pierDipi]

When the offset strategy is set to latest, we need to initialize
the offset in Kafka for that particular consumer group.

Signed-off-by: Pierangelo Di Pilato pierdipi@redhat.com

Part of #1537

[codecov]

Codecov Report

Merging #2091 (e8576a4) into main (5e5ade7) will decrease coverage by 16.13%.
The diff coverage is 69.69%.

@@              Coverage Diff              @@
##               main    #2091       +/-   ##
=============================================
- Coverage     82.69%   66.56%   -16.14%     
+ Complexity      676      675        -1     
=============================================
  Files            72      142       +70     
  Lines          2289     9130     +6841     
  Branches        195      195               
=============================================
+ Hits           1893     6077     +4184     
- Misses          291     2648     +2357     
- Partials        105      405      +300     

Flag	Coverage Δ
java-unittests	82.61% <ø> (-0.09%)	⬇️

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

Impacted Files	Coverage Δ
...afka/eventing/v1alpha1/consumer_group_lifecycle.go	0.00% <0.00%> (ø)
...nternals/kafka/eventing/v1alpha1/consumer_types.go	79.41% <ø> (ø)
...l-plane/pkg/reconciler/consumergroup/controller.go	57.82% <ø> (ø)
...lane/pkg/reconciler/consumergroup/consumergroup.go	76.52% <63.63%> (ø)
control-plane/pkg/reconciler/consumergroup/auth.go	76.47% <76.47%> (ø)
...rnals/kafka/eventing/v1alpha1/consumer_defaults.go	82.35% <100.00%> (ø)
control-plane/pkg/reconciler/consumer/consumer.go	51.27% <100.00%> (ø)
...a/broker/dispatcher/impl/RecordDispatcherImpl.java	89.88% <0.00%> (-1.13%)	⬇️
control-plane/pkg/reconciler/trigger/controller.go	82.72% <0.00%> (ø)
...kafka/eventing/v1alpha1/consumer_group_defaults.go	100.00% <0.00%> (ø)
... and 67 more

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[pierDipi]

/test unit-tests_eventing-kafka-broker_main

[aavarghese]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aavarghese, pierDipi

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