[CM] Onboard maps to cross-type search (#155148)

## Summary

Part of https://github.com/elastic/kibana/issues/152224
Follow up to https://github.com/elastic/kibana/issues/153256

This PR onboards maps CM integration into the multi-type search
(`msearch`). It isn't actually used anywhere in the user-facing UI yet,
as first other types need to be migrated to CM.

This PR also adds an example app to test the `msearch` end-to-end.

packages/kbn-object-versioning/lib/content_management_services_schemas.ts

@@ -103,6 +103,20 @@ const searchSchemas = getOptionalInOutSchemas({
   ),
 });
 
+// Schema to validate the "msearch" service objects
+const mSearchSchemas = schema.maybe(
+  schema.object({
+    out: schema.maybe(
+      schema.object(
+        {
+          result: schema.maybe(versionableObjectSchema),
+        },
+        { unknowns: 'forbid' }
+      )
+    ),
+  })
+);
+
 export const serviceDefinitionSchema = schema.object(
   {
     get: getSchemas,
@@ -111,6 +125,7 @@ export const serviceDefinitionSchema = schema.object(
     update: createSchemas,
     delete: getSchemas,
     search: searchSchemas,
+    mSearch: mSearchSchemas,
   },
   { unknowns: 'forbid' }
 );

packages/kbn-object-versioning/lib/content_management_services_versioning.test.ts

@@ -240,6 +240,7 @@ describe('CM services getTransforms()', () => {
             'delete.out.result',
             'search.in.options',
             'search.out.result',
+            'mSearch.out.result',
           ].sort()
         );
       });

packages/kbn-object-versioning/lib/content_management_services_versioning.ts

@@ -34,6 +34,7 @@ const serviceObjectPaths = [
   'delete.out.result',
   'search.in.options',
   'search.out.result',
+  'mSearch.out.result',
 ];
 
 const validateServiceDefinitions = (definitions: ServiceDefinitionVersioned) => {
@@ -175,6 +176,11 @@ const getDefaultServiceTransforms = (): ServiceTransforms => ({
       result: getDefaultTransforms(),
     },
   },
+  mSearch: {
+    out: {
+      result: getDefaultTransforms(),
+    },
+  },
 });
 
 export const getTransforms = (

packages/kbn-object-versioning/lib/content_management_types.ts

@@ -59,6 +59,11 @@ export interface ServicesDefinition {
       result?: VersionableObject<any, any, any, any>;
     };
   };
+  mSearch?: {
+    out?: {
+      result?: VersionableObject<any, any, any, any>;
+    };
+  };
 }
 
 export interface ServiceTransforms {
@@ -112,6 +117,11 @@ export interface ServiceTransforms {
       result: ObjectTransforms<any, any, any, any>;
     };
   };
+  mSearch: {
+    out: {
+      result: ObjectTransforms<any, any, any, any>;
+    };
+  };
 }
 
 export interface ServiceDefinitionVersioned {