feat(manager): support kustomize (#5484)

lib/manager/kustomize/__fixtures__/gitImages.yaml

lib/manager/kustomize/__fixtures__/gitSshBase.yaml

lib/manager/kustomize/__fixtures__/gitSubdir.yaml

lib/manager/kustomize/__fixtures__/kustomizeEmpty.yaml

lib/manager/kustomize/__fixtures__/kustomizeHttp.yaml

lib/manager/kustomize/__fixtures__/kustomizeWithLocal.yaml

...nager/kustomize/__fixtures__/service-1/kustomization.yaml

lib/manager/kustomize/__fixtures__/service.yaml

lib/manager/kustomize/__snapshots__/extract.spec.ts.snap

lib/manager/kustomize/extract.spec.ts

lib/manager/kustomize/extract.ts

lib/manager/kustomize/index.ts

lib/manager/kustomize/readme.md