Redis Stream Source Unit + E2E Tests

[aavarghese]

Included in this PR:

• Unit tests for stream source api, lifecycle test, adapter, receive adapter etc
• Vendor dir updates (after updating K8 deps to v18.8)
• Code updates (after updating K8 deps to v18.8)
• Setup for github actions
• Adding test dir

[aavarghese]

https://github.com/aavarghese/eventing-redis/runs/1221235701?check_suite_focus=true

Github showing same error as my local setup, even after updating all dependencies.

vendor/knative.dev/pkg/metrics/stackdriver_exporter.go:357:65: too many arguments in call to kubeclient.CoreV1().Secrets(secretNamespace).Get
	have (context.Context, string, "k8s.io/apimachinery/pkg/apis/meta/v1".GetOptions)
	want (string, "k8s.io/apimachinery/pkg/apis/meta/v1".GetOptions)
# knative.dev/pkg/test/ingress
vendor/knative.dev/pkg/test/ingress/ingress.go:51:71: too many arguments in call to kubeClientset.CoreV1().Services(ingressNamespace).Get
	have (context.Context, string, "k8s.io/apimachinery/pkg/apis/meta/v1".GetOptions)
	want (string, "k8s.io/apimachinery/pkg/apis/meta/v1".GetOptions)
# knative.dev/pkg/test/monitoring
vendor/knative.dev/pkg/test/monitoring/monitoring.go:49:58: too many arguments in call to kubeClientset.CoreV1().Pods(namespace).List
	have (context.Context, "k8s.io/apimachinery/pkg/apis/meta/v1".ListOptions)
	want ("k8s.io/apimachinery/pkg/apis/meta/v1".ListOptions)
FAIL	knative.dev/eventing-redis/test/e2e [build failed]
# knative.dev/pkg/apis/duck
vendor/knative.dev/pkg/apis/duck/typed.go:52:44: too many arguments in call to dif.Client.Resource(gvr).List
	have (context.Context, "k8s.io/apimachinery/pkg/apis/meta/v1".ListOptions)
	want ("k8s.io/apimachinery/pkg/apis/meta/v1".ListOptions)
vendor/knative.dev/pkg/apis/duck/typed.go:58:62: cannot use dif.Client.Resource(gvr).List (type func("k8s.io/apimachinery/pkg/apis/meta/v1".ListOptions) (*unstructured.UnstructuredList, error)) as type unstructuredLister in argument to asStructuredLister
vendor/knative.dev/pkg/apis/duck/typed.go:59:63: cannot use dif.Client.Resource(gvr).Watch (type func("k8s.io/apimachinery/pkg/apis/meta/v1".ListOptions) (watch.Interface, error)) as type structuredWatcher in argument to AsStructuredWatcher

Am I missing some other step other than hack/update*.sh? cc: @lionelvillard

[aavarghese]

cc @lionelvillard this set ready for review. I don't have an e2e test functional yet but other than that, test setup version 1 is in this PR. Can you take a look and let me know what you think so far?

[lionelvillard]

/lgtm
/approve

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