refactor(dev-infra): refactor commit-message files (#38845)

Refactor the commit-message files to be consistent with how other ng-dev tooling
is structured.

PR Close #38845

dev-infra/commit-message/wizard/cli.ts

@@ -0,0 +1,54 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Arguments, Argv, CommandModule} from 'yargs';
+
+import {CommitMsgSource} from '../commit-message-source';
+
+import {runWizard} from './wizard';
+
+
+export interface WizardOptions {
+  filePath: string;
+  commitSha: string|undefined;
+  source: CommitMsgSource|undefined;
+}
+
+/** Builds the command. */
+function builder(yargs: Argv) {
+  return yargs
+      .positional('filePath', {
+        description: 'The file path to write the generated commit message into',
+        type: 'string',
+        demandOption: true,
+      })
+      .positional('source', {
+        choices: ['message', 'template', 'merge', 'squash', 'commit'] as const,
+        description: 'The source of the commit message as described here: ' +
+            'https://git-scm.com/docs/githooks#_prepare_commit_msg'
+      })
+      .positional('commitSha', {
+        description: 'The commit sha if source is set to `commit`',
+        type: 'string',
+      });
+}
+
+/** Handles the command. */
+async function handler(args: Arguments<WizardOptions>) {
+  await runWizard(args);
+}
+
+/** yargs command module describing the command.  */
+export const WizardModule: CommandModule<{}, WizardOptions> = {
+  handler,
+  builder,
+  command: 'wizard <filePath> [source] [commitSha]',
+  // Description: Run the wizard to build a base commit message before opening to complete.
+  // No describe is defiend to hide the command from the --help.
+  describe: false,
+};