Connect-sdk

* Fix: Accept rql.Query in resources list method.
* Fix: Bug causing some schemas not parsing all the fields.

* Feature: Allow masking of specified log fields.
* Change: Upgrade pytest to version 4.6.8.
* Fix: Added date to log formatter.

* Feature: Updated models for v18.
* Feature: Add RQL filter support.
* Fix: UsageFileAction's subclass SubmitUsageFile had a rejection note, a parameter which should go in RejectUsageFile instead.

* Fix: `ServerErrorResponseSchema` has a wrong errors field definition, it must be a list of strings.
* Fix: `function_log` decorator use list comprehension to set a custom formatter for each logging handler configured for the current logger. Changed to a for loop.

* Fix: UsageFileAction's subclass SubmitUsageFile has a rejection note, a parameter which should go in RejectUsageFile instead.

* Fix: Due to a bug the log handler was being added for every request, causing log messages being printed twice on the 2nd requests, thrice on the third request, etc.
* Fix: Some fields cannot be properly parsed because their schemas inherit from Schema instead of BaseSchema.
* Fix: A Conversation should not add a message when it is the same as the latest one added.