KafkaSource and KafkaBinding v1beta1 umbrella task

[aliok]

Similar to the structure at knative/eventing#3411

• 1. Type bumps: kafka src/binding type bumps #1294
• 2. Conversion: KafkaSource and binding v1beta1<>v1alpha1 conversion #1341
• 3. Webhook config for defaulting + validation + conversion: KafkaSource/KafkaBinding v1beta1 webhook #1346
• 4. Add new version to CRD and update the CRD field descriptions: KafkaSource/KafkaBinding v1beta1 CRD #1347
• 5. Update docs and examples: KafkaSource/KafkaBinding v1beta1 docs and examples #1348
• 6. Update e2e tests to use new version: KafkaSource/KafkaBinding update e2e tests to use v1beta1 #1375
• 7. Make new version the storage version: Make KafkaSource and KafkaBinding v1beta1 resources the stored version #1394
• 8. Migrate reconciler to new version: Make reconcilers use KafkaSource and KafkaBinding v1beta1 resources #1395
• 9. Remove old version (long term goal)

[aliok]

/assign

[matzew]

@aliok what about (in separate PR?) doing the krshapedlogic ?

example: knative/eventing#3226

[aliok]

/close

Created tickets in new repo, knative-sandbox/eventing-kafka for the remaining tasks: knative-extensions/eventing-kafka#65