feat!: Allowing custom thread pool size to configure#736

vishalzanzrukia wants to merge 2 commits intosendgrid:mainsendgrid/sendgrid-java:mainfrom

vishalzanzrukia:feature/allow-custom-threadpool-sizevishalzanzrukia/sendgrid-java:feature/allow-custom-threadpool-sizeCopy head branch name to clipboard