Use OWNERS-based labeling for kind/api-change

This replaces the following path-label munger config, except
we're using kind/api-change for everything instead of two
different kind/ labels

```
^pkg/api/([^/]+/)?types.go$    kind/api-change
^pkg/api/([^/]+/)?register.go$ kind/new-api
^pkg/apis/[^/]+/([^/]+/)?types.go$    kind/api-change
^pkg/apis/[^/]+/([^/]+/)?register.go$ kind/new-api
```

pkg/api/OWNERS

@@ -1,4 +1,15 @@
-approvers:
+# See the OWNERS docs at https://go.k8s.io/owners
-- api-approvers
+
-reviewers:
+filters:
-- api-reviewers
+  ".*":
+    approvers:
+      - api-approvers
+    reviewers:
+      - api-reviewers
+
+  # examples:
+  #   pkg/api/types.go
+  #   pkg/api/*/register.go
+  "([^/]+/)?(register|types)\\.go$":
+    labels:
+      - kind/api-change

pkg/apis/OWNERS

@@ -1,44 +1,55 @@
-approvers:
+# See the OWNERS docs at https://go.k8s.io/owners
-- erictune
+
-- lavalamp
+filters:
-- smarterclayton
+  ".*":
-- thockin
+    approvers:
-- liggitt
+    - erictune
-# - bgrant0607 # manual escalations only
+    - lavalamp
-reviewers:
+    - smarterclayton
-- lavalamp
+    - thockin
-- smarterclayton
+    - liggitt
-- wojtek-t
+    # - bgrant0607 # manual escalations only
-- deads2k
+    reviewers:
-- yujuhong
+    - lavalamp
-- brendandburns
+    - smarterclayton
-- derekwaynecarr
+    - wojtek-t
-- caesarxuchao
+    - deads2k
-- vishh
+    - yujuhong
-- mikedanese
+    - brendandburns
-- liggitt
+    - derekwaynecarr
-- nikhiljindal
+    - caesarxuchao
-- gmarek
+    - vishh
-- erictune
+    - mikedanese
-- pmorie
+    - liggitt
-- sttts
+    - nikhiljindal
-- dchen1107
+    - gmarek
-- saad-ali
+    - erictune
-- luxas
+    - pmorie
-- janetkuo
+    - sttts
-- justinsb
+    - dchen1107
-- pwittrock
+    - saad-ali
-- ncdc
+    - luxas
-- tallclair
+    - janetkuo
-- yifan-gu
+    - justinsb
-- eparis
+    - pwittrock
-- mwielgus
+    - ncdc
-- feiskyer
+    - tallclair
-- soltysh
+    - yifan-gu
-- piosz
+    - eparis
-- dims
+    - mwielgus
-- errordeveloper
+    - feiskyer
-- madhusudancs
+    - soltysh
-- krousey
+    - piosz
-- rootfs
+    - dims
-- jszczepkowski
+    - errordeveloper
+    - madhusudancs
+    - krousey
+    - rootfs
+    - jszczepkowski
+
+  # examples:
+  #   pkg/apis/*/types.go
+  #   pkg/apis/*/*/types.go
+  "[^/]+/([^/]+/)?(register|types)\\.go$":
+    labels:
+      - kind/api-change