API methods to handle teams and users

[kevinpapst]

Description

Planned methods:

• create team
• update team
• add member to team
• remove member from team
• grant access to customer/project
• revoke access from customer/project
• create user
• update user

Fixes #1331

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I verified that my code applies to the guidelines (composer kimai:code-check)
• I updated the documentation (see here)
• I agree that this code is used in Kimai and will be published under the MIT license

[kevinpapst]

@kbancerz this PR is ready for testing, want to jump in?

[codecov]

Codecov Report

Merging #1384 into master will decrease coverage by 0.06%.
The diff coverage is 60.97%.

@@             Coverage Diff              @@
##             master    #1384      +/-   ##
============================================
- Coverage     92.63%   92.57%   -0.07%     
- Complexity     4062     4074      +12     
============================================
  Files           384      384              
  Lines         12391    12418      +27     
============================================
+ Hits          11479    11496      +17     
- Misses          912      922      +10

Impacted Files	Coverage Δ	Complexity Δ
src/API/UserController.php	87.5% <ø> (-0.18%)	16 <0> (ø)
src/Command/UpdateCommand.php	60.34% <43.75%> (-4.37%)	16 <0> (+3)
src/Controller/DoctorController.php	72.56% <53.84%> (-1.48%)	38 <0> (+4)
src/Utils/ParsedownExtension.php	96.87% <91.66%> (-3.13%)	9 <5> (+5)

[lock]

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