Add SPDX license header checker and missing headers - #999

Add SPDX license header checker and missing headers#999

shreyah963 wants to merge 2 commits into

opensearch-project:mainopensearch-project/common-utils:mainfrom

shreyah963:add-spdx-license-header-checkershreyah963/common-utils:add-spdx-license-header-checkerCopy head branch name to clipboard