Initial code for adding users to groups upon creation

[martintc]

I'm submitting a

• bug fix
• feature
• documentation addition

What is the current behaviour?

No way to add users to groups.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

What is the expected behavior?

The ability to add users to group during the user creation step.

What is the motivation / use case for changing the behavior?

Better configuration management for users

Please tell us about your environment:

Version (comtrya --version): Main branch on repo
Operating system: Fedora 36

[codecov-commenter]

Codecov Report

Base: 44.81% // Head: 47.51% // Increases project coverage by +2.69% 🎉

Coverage data is based on head (849963b) compared to base (53a48ab).
Patch coverage: 80.28% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
+ Coverage   44.81%   47.51%   +2.69%     
==========================================
  Files          77       77              
  Lines        2557     2635      +78     
==========================================
+ Hits         1146     1252     +106     
+ Misses       1411     1383      -28     

Impacted Files	Coverage Δ
lib/src/actions/user/mod.rs	0.00% <0.00%> (ø)
lib/src/actions/user/providers/freebsd.rs	0.00% <0.00%> (ø)
lib/src/actions/user/providers/mod.rs	28.57% <ø> (+28.57%)	⬆️
lib/src/actions/user/providers/none.rs	0.00% <0.00%> (ø)
lib/src/actions/user/providers/linux.rs	90.90% <89.47%> (+90.90%)	⬆️
lib/src/actions/group/providers/linux.rs	91.66% <100.00%> (+91.66%)	⬆️
lib/src/actions/group/providers/mod.rs	33.33% <0.00%> (+33.33%)	⬆️

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[icepuma]

lgtm