feat: Add support for single_level query parameter in ListFoldersQuery#281

AaronDDM merged 2 commits intomainnylas/nylas-java:mainfrom

TW-3956-add-sdk-support-for-the-new-single-level-folders-endpoint-query-paramnylas/nylas-java:TW-3956-add-sdk-support-for-the-new-single-level-folders-endpoint-query-paramCopy head branch name to clipboard