[Logic] Missing JSON keys and wrong naming

[lmazuel]

In RecurrenceSchedule, a customer found out that:

• "weekDays" is actually "days" on the wire
• "timeZone" is missing

This needs to be confirmed by Logic team and eventually added to the Swagger.

Reference:
Azure/azure-sdk-for-python#1798
Azure/azure-sdk-for-python#1797