Use Guzzle stream to download files from GDrive

[PVince81]

The API library does not support streaming and always reads the full
file into memory.

This workaround copies the signed headers to a Guzzle request and
returns the response as stream.

Inspired by @icewind1991's approach for DAV: #18653

Before: (the download takes a while to start due to temp storage)

  % curl "http://root:admin@localhost/owncloud/remote.php/webdav/gdrive/direct%20upload/BigBuckBunny_320x180.mp4" -o test_master.mp4
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 61.6M  100 61.6M    0     0   352k      0  0:02:59  0:02:59 --:--:-- 16.6M

After:

  % curl "http://root:admin@localhost/owncloud/remote.php/webdav/gdrive/direct%20upload/BigBuckBunny_320x180.mp4" -o test.mp4
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 61.6M  100 61.6M    0     0   712k      0  0:01:28  0:01:28 --:--:--  785k

Fixes the download part of #21357

Please review @icewind1991 @Xenopathic

[mention-bot]

By analyzing the blame information on this pull request, we identified @Xenopathic, @MTGap and @icewind1991 to be potential reviewers

[karlitschek]

nice 👍

[PVince81]

@MorrisJobke

[icewind1991]

Looks good 👍

[PVince81]

@karlitschek backport to 8.2.2 at least ?

[karlitschek]

backport is fine if this is fully tested. 👍

[PVince81]

@davitol mind doing another test for this PR ? The only test needed is downloading, see original post. Maybe spice it up a bit with encryption and shares 😄

[PVince81]

stable8.2: #21825

[lock]

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