fix: correct type exports for ESM compatibility

- Use 'export type' for type-only exports in utils/index.ts
- Import types with 'import type' to avoid runtime imports
- Fixes module resolution issues with tsup build

Author: marshallswain

src/utils/index.ts

@@ -1,12 +1,12 @@
 'use strict'
 
 import { removeProps } from './core'
-import { ESSearchResponse, ESHit, ESBulkResponseItem } from '../types'
+import type { ESSearchResponse, ESHit, ESBulkResponseItem } from '../types'
 
 export * from './core'
 export * from './parse-query'
 export * from './params'
-export { ESSearchResponse, ESHit, ESBulkResponseItem } from '../types'
+export type { ESSearchResponse, ESHit, ESBulkResponseItem } from '../types'
 
 /**
  * Maps Elasticsearch find results to Feathers format