PYTHON-4690 Add repr for FixedOffset eg FixedOffset(datetime.timedelta(seconds=3600), '+60'))#1806

ShaneHarvey merged 3 commits intomongodb:mastermongodb/mongo-python-driver:masterfrom

ShaneHarvey:PYTHON-4663-reprShaneHarvey/mongo-python-driver:PYTHON-4663-reprCopy head branch name to clipboard