Support new snowplow data model

### Describe the feature
It looks like Snowplow has switched to the new of processing raw data https://github.com/snowplow/data-models and call new data model as V1. Current implementation of DBT module does not suits it anymore. New data model should be supported/adopted by DBT snowplow module.

### Describe alternatives you've considered
Possible workaround - create by DBT module all snowplow tables by parsing JSON fields in EVENTS table. E.g. create table com_snowplowanalytics_snowplow_web_page_1 by parsing field EVENTS.contexts_com_snowplowanalytics_snowplow_web_page_1

### Who will this benefit?
All users who has using DBT and Snwoplow at the same time on their projects.