Add concept of user groups

[ml-evs]

This PR adds the concept of groups of users, and the corresponding API routes and UIs. The aim of groups is to be able to provide blanket permissions to subsets of users. Some statements:

• Users are created without any group.
• Currently only admins can create groups and assign users to them, though it is already possible to list users as admins for a group (and in future they will control access).

Still to-do:

• Use these in permissions lookups
• Allow users to assign samples as visible to groups on creation and edit
• Default permissions for groups

[codecov]

Codecov Report

Attention: Patch coverage is 74.78992% with 30 lines in your changes missing coverage. Please review.

Project coverage is 70.26%. Comparing base (81beb95) to head (6d01fdc).

Files with missing lines	Patch %	Lines
pydatalab/src/pydatalab/routes/v0_1/admin.py	57.14%	21 Missing ⚠️
pydatalab/src/pydatalab/mongo.py	64.70%	6 Missing ⚠️
pydatalab/src/pydatalab/login.py	66.66%	2 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/users.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1062      +/-   ##
==========================================
+ Coverage   69.98%   70.26%   +0.28%     
==========================================
  Files          62       63       +1     
  Lines        4038     4140     +102     
==========================================
+ Hits         2826     2909      +83     
- Misses       1212     1231      +19     

Files with missing lines	Coverage Δ
pydatalab/src/pydatalab/models/people.py	93.75% <100.00%> (+1.15%)	⬆️
pydatalab/src/pydatalab/routes/v0_1/__init__.py	100.00% <100.00%> (ø)
pydatalab/src/pydatalab/routes/v0_1/groups.py	100.00% <100.00%> (ø)
pydatalab/src/pydatalab/routes/v0_1/items.py	84.89% <ø> (+2.05%)	⬆️
pydatalab/src/pydatalab/routes/v0_1/users.py	91.07% <93.75%> (+0.82%)	⬆️
pydatalab/src/pydatalab/login.py	82.60% <66.66%> (-1.77%)	⬇️
pydatalab/src/pydatalab/mongo.py	76.19% <64.70%> (-2.92%)	⬇️
pydatalab/src/pydatalab/routes/v0_1/admin.py	63.52% <57.14%> (-5.71%)	⬇️

... and 1 file with indirect coverage changes

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[cypress]

datalab    Run #2974

Run Properties:   Passed #2974  •  07afc65d63 ℹ️: Merge 6d01fdc8dcc8e6c88016e2bf7864567a851bfdba into 81beb95f5b505ca74826aebb522f...

Project	datalab
Branch Review	ml-evs/user-groups
Run status	Passed #2974
Run duration	06m 48s
Commit	07afc65d63 ℹ️: Merge 6d01fdc8dcc8e6c88016e2bf7864567a851bfdba into 81beb95f5b505ca74826aebb522f...
Committer	Matthew Evans
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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	471
View all changes introduced in this branch ↗︎