Added functionality to Datasource, to add an empty extract, and to filter the extract

[JustinGrilli]

Summary

Our Astronomer / Airflow workers running updates on our datasources have been failing.
We discovered this was because the size of our datasources exceeded the 10GB storage limit for the Astronomer workers.

So, to help adjust the size of our Datasources while making updates, I am adding functionality to allow for manipulating the Datasource extract (.hyper file).

Changes

• Added functionality to the Datasource class
  • empty_extract: To create an empty extract for the Datasource connection.
  • filter_extract: To delete data from the extract, based on a provided condition string.
• Added --empty_extract (-E) and --filter_extract (-F) to the datasource CLI command args

Tests

tableau_utilities -l online -n Datasource -pn Project -f Datasource.tdsx datasource -E
tableau_utilities -n Datasource -pn Project -f Datasource.tdsx server_operate --publish datasource

• Download datasource without including the extract, and create an empty extract
• Publish the datasource (normally you would not be able to publish a datasource downloaded without an extract, now we can!)

tableau_utilities -l online -n Datasource -pn Project -f Datasource.tdsx --include_extract datasource -E
tableau_utilities -n Datasource -pn Project -f Datasource.tdsx server_operate --publish datasource

• Download datasource including the extract, and overwrite extract with an empty extract
• Publish the datasource

tableau_utilities -l online -n Datasource -pn Project -f Datasource.tdsx --include_extract datasource -F "\"CREATED_AT\" < '1/1/2024'"
tableau_utilities -n Datasource -pn Project -f Datasource.tdsx server_operate --publish datasource

• Download datasource including the extract, and delete extract data from before 1/1/2024
• Publish the datasource