[data.search.aggs]: Clean up TimeBuckets implementation

Part of elastic#60130

src/plugins/data/public/index.ts

@@ -299,6 +299,7 @@ import {
   propFilter,
   siblingPipelineType,
   termsAggFilter,
+  TimeBuckets,
   // expressions utils
   getRequestInspectorStats,
   getResponseInspectorStats,
@@ -403,6 +404,7 @@ export const search = {
     siblingPipelineType,
     termsAggFilter,
     toAbsoluteDates,
+    TimeBuckets,
   },
   getRequestInspectorStats,
   getResponseInspectorStats,

src/plugins/data/public/search/aggs/buckets/index.ts

@@ -25,5 +25,6 @@ export * from './ip_range';
 export * from './lib/cidr_mask';
 export * from './lib/date_range';
 export * from './lib/ip_range';
+export * from './lib/time_buckets';
 export * from './migrate_include_exclude_format';
 export * from './terms';