Add Google Drive board

[juliasilge]

Closes #728

Wow, using Google Drive for this is not speedy 😳

[juliasilge]

We should definitely not run the tests for board_gdrive() in CI; they take basically INFINITY amount of time. We also run the tests for board_ms365() only locally, and the use of Microsoft OneDrive is equivalent in many ways to Google Drive here.

[hadley]

Any hope of speeding it up by caching drive ids somewhere?

[juliasilge]

Any hope of speeding it up by caching drive ids somewhere?

I don't believe so. There's no "extra" mapping between drive ID and something else that we can cache somewhere (like the Connect mappings from GUID to content name).

Just for clarity here, the normal pins caching mechanism does work as expected here, so you don't re-download pin content if it hasn't changed. However, even the process of looking up the pin metadata to check this feels sluggish.

[github-actions]

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