Add group cli to editoast

[flomonster]

Add a bunch of commands to manage users and groups.

close #8754

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 131 lines in your changes missing coverage. Please review.

Project coverage is 37.80%. Comparing base (a4daa6d) to head (bb0e0d9).
Report is 16 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/client/group.rs	0.00%	95 Missing ⚠️
editoast/src/client/user.rs	0.00%	36 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9734      +/-   ##
==========================================
- Coverage   37.85%   37.80%   -0.06%     
==========================================
  Files         990      992       +2     
  Lines       90928    91097     +169     
  Branches     1176     1176              
==========================================
+ Hits        34423    34439      +16     
- Misses      56051    56204     +153     
  Partials      454      454              

Flag	Coverage Δ
editoast	72.97% <0.00%> (-0.34%)	⬇️
front	20.10% <ø> (-0.01%)	⬇️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[leovalais]

Tested. A few comments about the interface:

• both group include and group exclude accept an empty list of users and exit 0 without a warning of some sort
• if a user ID provided to group include doesn't exist, the postgres error is the only one shown (insert or update on table "authn_group_membership" violates foreign key constraint "authn_group_membership_user_fkey")
• group exclude doesn't check that the provided users actually exist and are in the group. In which case the command does nothing and exits 0.

Those remarks are not that important especially since this CLI should be merged fast, but I'd rather draw some attention to them just to be sure.