Changes to Create a maintenance plan

added the new optional request property intervalStrategy

added the new optional request property meterGenerationDueOffset

added the new optional request property meterGenerationStartOffset

added the new optional request property meterHorizonValue

added the new optional request property meterId

added the new optional request property meterIntervalValue

added the new optional request property meterNextDueValue

added the new optional request property meterTriggerCondition

added the new optional request property triggerType

added subschema #5: Periodically to the recurrence request property oneOf list

endpoint added