Add Table manipulation methods

Is your feature request related to a problem? Please describe. gspread currently doesn't support the manipulation of the new Table entity on Google Sheets. Tables are a neat feature that increase the flexibility of the Google Sheets tool, so manipulating tables using Python is a great advantage.

Describe the solution you'd like Methods like creat_table,add_table_row`, etc

Describe alternatives you've considered None

Additional context I created a modified version of the Worksheet object, and can append rows to table while automatically extending them, so I know this is possible using teh Google Sheets API