openapi: Add ComposeRequest as part of the ComposeMetadata response

This will allow clients to display more information about a compose,
including the image type created, arch and distro, and blueprint to
customizations used to create it.

Related: RHEL-60120

internal/cloudapi/v2/openapi.v2.yml

@@ -1050,6 +1050,9 @@ components:
           ostree_commit:
             type: string
             description: 'ID (hash) of the built commit'
+          request:
+            $ref: '#/components/schemas/ComposeRequest'
+            description: 'Original request to create this compose'
     PackageMetadata:
       required:
         - type