Add missing handler for resource subscribe/unsubscribe handlers#220

bigdevlarry wants to merge 2 commits intomodelcontextprotocol:mainmodelcontextprotocol/php-sdk:mainfrom

bigdevlarry:Add-missing-handler-for-Resource-Subscribe-Unsubscribebigdevlarry/php-sdk:Add-missing-handler-for-Resource-Subscribe-UnsubscribeCopy head branch name to clipboard