[QA] Generate Code Owners

Record to codeowners.

Types fixup

Not done yet, but so far I've got a sorta-solution for
just the files, not the excludeFiles.

The rub is that one of my expressions breaks when I use the real
rule set.  There's something in the real rule set that I'm not
considering.  But, I'm sleepy lol

Meh, for codeowners, this is done.

.ci/Jenkinsfile_coverage

@@ -12,9 +12,10 @@ kibanaPipeline(timeoutMinutes: 240) {
     ]) {
       workers.base(name: 'coverage-worker', size: 'l', ramDisk: false, bootstrapped: false) {
         catchError {
-          kibanaCoverage.runTests()
-          kibanaTeamAssign.load('team_assignment', "### Upload Team Assignment JSON")
-          handleIngestion(TIME_STAMP)
+//          kibanaCoverage.runTests()
+//          kibanaTeamAssign.load('team_assignment', "### Upload Team Assignment JSON")
+//          handleIngestion(TIME_STAMP)
+          kibanaTeamAssign.generateCodeOwners('.github/CODEOWNERS', "### Generate CODEOWNERS")
         }
         handleFail()
       }

packages/kbn-dev-utils/src/code_ownership/index.ts

@@ -0,0 +1,48 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { createFlagError, run, RunContext } from '../run';
+import { rules } from './ownership_config';
+import { record } from './record';
+
+const description = `
+
+Create .github/CODEOWNERS file from authoritative source
+
+`;
+
+export const generateCodeOwners = () => {
+  run(
+    ({ flags, log }: RunContext) => {
+      if (flags.codeOwnersPath === '')
+        throw createFlagError('please provide a single --codeOwnersPath flag');
+
+      record(flags.codeOwnersPath as string, log, rules);
+    },
+    {
+      description,
+      flags: {
+        string: ['codeOwnersPath'],
+        help: `
+--codeOwnersPath       Required, path to CODEOWNERS file.
+        `,
+      },
+    }
+  );
+};