Regenerate client using Stone 3.2.0

[yuxiang-he]

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• SDK Code Change
• Example/Test Code Change

Validation

• Does tox pass?
• Do the tests pass?

Changes

• Specs are regenerated using Stone 3.2.0
• Fix relative import issues with the breaking change introduced in Stone 2.0.0
• [breaking change] dropbox.dropbox is now renamed to dropbox.dropbox_client
• test/requirements.txt now needs Stone as well

[codecov]

Codecov Report

Merging #291 (c6c46a5) into main (50f1d99) will increase coverage by 16.61%.
The diff coverage is 74.25%.

@@             Coverage Diff             @@
##             main     #291       +/-   ##
===========================================
+ Coverage   46.96%   63.58%   +16.61%     
===========================================
  Files          30       30               
  Lines       78958    48223    -30735     
  Branches     6514     3537     -2977     
===========================================
- Hits        37086    30662     -6424     
+ Misses      41821    17533    -24288     
+ Partials       51       28       -23     

Flag	Coverage Δ
unit	63.58% <74.25%> (+16.61%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
dropbox/files.py	66.58% <ø> (+19.15%)	⬆️
dropbox/paper.py	70.76% <ø> (+21.03%)	⬆️
dropbox/sharing.py	65.81% <ø> (+19.68%)	⬆️
dropbox/stone_base.py	0.00% <0.00%> (-47.62%)	⬇️
dropbox/stone_serializers.py	0.00% <0.00%> (-18.13%)	⬇️
dropbox/stone_validators.py	0.00% <0.00%> (-45.79%)	⬇️
dropbox/team.py	66.02% <ø> (+19.87%)	⬆️
dropbox/team_log.py	62.82% <ø> (+15.53%)	⬆️
dropbox/file_properties.py	68.92% <69.34%> (+19.94%)	⬆️
dropbox/users.py	62.93% <69.91%> (+21.10%)	⬆️
... and 21 more

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[yuxiang-he]

I think we can just skip generating stone_base.py stone_validators.py and stone_serializers.py, but that would most likely be another breaking change in tone

[rogebrd]

Since this is breaking, can you create an UPGRADING.md file similar to UPGRADING.md in order to make sure people know how to upgrade to the new SDK?

Side Note: Glad to see all the removed code

[rogebrd]

Looks good overall, just need to update the link in UPGRADING.md