refactor(typescript)!: drop EmptyString

- import from @flex-development/tutils if needed going forward

Author: unicornware

packages/exceptions/src/types/empty-string.type.ts

@@ -3,7 +3,6 @@
  * @module exceptions/types
  */
 
-export type { EmptyString } from './empty-string.type'
 export type { ExceptionData } from './exception-data.type'
 export type { ExceptionErrors } from './exception-errors.type'
 export type { ValidationExceptionErrors } from './validation-exception-errors.type'