Load and store the sheet's GID

[fulldecent]

When linking to a Google Sheet, you can hyperlink directly to a specific cell. This requires knowing the cell/range address (like "C2") and the sheet's GID. The GID of the first sheet (tab) when the Google Sheet is created is 0. However, to make more robust links into a spreadsheet, you should not assume that only the first sheet is the one you want and that there are no other sheets in the file.

Therefore it will be helpful to collect and store each sheet's (tab's) GID into the database somehow.