add content-type interceptor#226

cfaur09 wants to merge 3 commits intomainmultiversx/mx-sdk-nestjs:mainfrom

SERVICES-2496-add-support-for-application-json-content-type-for-post-requestsmultiversx/mx-sdk-nestjs:SERVICES-2496-add-support-for-application-json-content-type-for-post-requestsCopy head branch name to clipboard