feat(301): add undelete example

Adding an example implementation of the undelete pattern.

Author: toumorokoshi

buf.lock

@@ -2,11 +2,11 @@
 version: v2
 deps:
   - name: buf.build/aep/api
-    commit: 1454930c8f994a1980143dae475be0a2
-    digest: b5:7c0b638065cd7705d85bdddc0c3cd22bf7b438e27e14109f811a3bd5c01d92318901b5aa63173de6e31f1cff75f912c953e72cc03487b717e72bbe1de264ee25
+    commit: f9844266f27f43ee861dce4ac7335d0d
+    digest: b5:f7824771c2516b21bc5a9017eab1f93c92908dbfe0caca28dd1caccffbb38aaf005a357b49f5ca3efe507fa74b2ad66fa18892bd4415e526ae526ad8389bba69
   - name: buf.build/bufbuild/protovalidate
-    commit: f05a6f4403ce4327bae4f50f281c3ed0
-    digest: b5:f1d76430ee97c89cd2044e9ae1c510887b701ee7bca60564ebf82e3919e53cacefc830a0eb803277c2d98c5f313b4167e8914afc9f214332717a50b5e170e6f4
+    commit: 52f32327d4b045a79293a6ad4e7e1236
+    digest: b5:cbabc98d4b7b7b0447c9b15f68eeb8a7a44ef8516cb386ac5f66e7fd4062cd6723ed3f452ad8c384b851f79e33d26e7f8a94e2b807282b3def1cd966c7eace97
   - name: buf.build/googleapis/googleapis
     commit: 28151c0d0a1641bf938a7672c500e01d
     digest: b5:93b70089baa4fc05a92d3e52db91a4b7812db3b57b9664f6cb301733938cb630e377a938e8a56779388171c749c1d42a2e9a6c6230f2ff45f127a8102a6a27d0