[DRILL-8305] Add Implicit Fields to Google Sheets Reader

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.21.0
• Fix Version/s: 1.21.0
• Component/s: Storage - GoogleSheets
• Assignee: Charles Givre
• Reporter: Charles Givre
• Created: 12/Sep/22 03:54
• Updated: 15/Sep/22 14:34
• Resolved: 15/Sep/22 14:34

Description

GoogleSheets needs additional metadata fields to access the available data.  This PR adds framework for implicit metadata fields.  

This PR also adds the _sheets field which lists the available tabs within a Google Sheets document.