Cobbler-Frontend: Implement Settings CRUD

[SchoolGuy]

Fixes #51

TODO:

• Create - Implement Create, Update and Delete for Cobbler Settings #102
• Read
• Update - Implement Create, Update and Delete for Cobbler Settings #102
• Delete - Implement Create, Update and Delete for Cobbler Settings #102
• Handle connectivity issues to the server
• Show Cobbler Server Version in the Navbar
• Handle different Cobbler Versions - Handled via Compability to older Cobbler versions #104 as this is more complicated
• Deduplicate router-component for tests
• Tests

[codecov]

Codecov Report

Merging #89 (3d70a7b) into main (71b7643) will increase coverage by 2.86%.
The diff coverage is 58.20%.

❗ Current head 3d70a7b differs from pull request most recent head aef2894. Consider uploading reports for the commit aef2894 to get more accurate results

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   22.93%   25.80%   +2.86%     
==========================================
  Files          42       45       +3     
  Lines        1417     1461      +44     
  Branches      432      437       +5     
==========================================
+ Hits          325      377      +52     
+ Misses       1075     1064      -11     
- Partials       17       20       +3     

Flag	Coverage Δ
unit-cobbler-api	4.44% <77.77%> (+1.61%)	⬆️
unit-cobbler-frontend	72.42% <51.02%> (+5.89%)	⬆️
unit-typescript-xmlrpc	61.71% <ø> (ø)

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

Impacted Files	Coverage Δ
...d/src/app/settings/view/settings-view.component.ts	37.50% <37.50%> (ø)
...frontend/src/app/services/item-settings.service.ts	50.00% <42.85%> (ø)
...pp/common/viewable-tree/viewable-tree.component.ts	56.52% <56.52%> (ø)
...rojects/cobbler-api/src/lib/cobbler-api.service.ts	4.26% <77.77%> (+1.62%)	⬆️
projects/cobbler-frontend/src/app/app.component.ts	100.00% <100.00%> (+80.00%)	⬆️
...pp/common/editable-tree/editable-tree.component.ts	100.00% <100.00%> (ø)
...d/src/app/settings/edit/settings-edit.component.ts	100.00% <100.00%> (ø)
...er-frontend/src/app/services/auth-guard.service.ts	17.24% <0.00%> (+6.89%)	⬆️
.../cobbler-frontend/src/app/services/user.service.ts	65.00% <0.00%> (+30.00%)	⬆️
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 71b7643...aef2894. Read the comment docs.

[SchoolGuy]

The fix for the tests that the missing modules are imported should be split out tomorrow.

[SchoolGuy]

I made huge progress for multiple things but I am not yet ready to commit something today. I have feedback from @agraul what I can improve and this is what I will try to focus on tomorrow.

[SchoolGuy]

I will try to address the remaining open points and clean the git history before I will merge this PR.