[Fixes #20] add user create function

[mwallschlaeger]

Description

allows to create users through geonodectl. delivers a lot of refactoring for patching of any type of object.

Type of Change

Please select the relevant option:

• Bug fix
• New feature
• Documentation update
• Refactoring
• Release
• Other (please describe)

Related Issue

If there is an existing issue related to this pull request, please reference it here.

closes #20

Checklist

Please ensure that your pull request meets the following requirements:

• The pull request is limited to one type (docs, feature, bug fix, etc.)
• The pull request is as small as possible. Consider opening multiple pull requests instead of one large one.
• The feature or bug fix has been discussed and documented in an issue beforehand.

Additional Notes

Any additional information or context regarding the pull request can be provided here.

Thank you for creating this pull request