CUST-4111/CUST-4162: improve to more descriptive error response & validate event's start vs end time#300

googsvg merged 7 commits intomainnylas/nylas-java:mainfrom

CUST-4111-v-3-java-sdk-is-returning-bad-request-while-updating-eventnylas/nylas-java:CUST-4111-v-3-java-sdk-is-returning-bad-request-while-updating-eventCopy head branch name to clipboard