Missing support for filter expressions #76
Description
I have been trying to use the sample code provided here but it seems that there are filter expressions (that are used in the postman collection and are documented as supported in the documentation) that seems to not be supported. The request that I am trying is the 'filter eq and (val or val)' in the 'User tests with garbage' folder in the Postman collection.
Upon sending this request, an exception is thrown since there are some filter expressions that are not supported as a filter in the FilterExpression class (line 269 onwards, exception happening in the default case for the switch statement such as 'sw', 'ew' and 'pr'.
