Adds the feature to read permission attributes from LDAP

[nyuuyn]

Adds the feature to read permission attributes from LDAP, see also #2302

Sonar Cloud link: https://sonarcloud.io/summary/new_code?id=nyuuyn_taskana&branch=nyuuyn%2Fperms

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Release Notes:

Adds the feature to read permission attributes from LDAP via taskana.ldap.userPermissionsAttribute=permission

For the submitter:

• I updated the documentation and will supply links to the specific files
• I did not update the documentation
• I included a link to the SonarCloud branch analysis
• After integration of the PR, I added a description of changes on the current release notes
• I did not update the current release notes
• I put the ticket in review
• After integration of the pull request, I verified our bluemix test environment is not broken

Verified by the reviewer:

• Commit message format → (Closes) #: Your commit message. i.e. Closes Commit Hooks won't work without JIRA Tickets #2271: Your commit message.
• Submitter's update to documentation is sufficient
• SonarCloud analysis meets our standards
• Update of the current release notes reflects changes
• PR fulfills the ticket
• Edge cases and unwanted side effects are tested
• Readability

[ryzheboka]

Thanks for your work!

The standard for TASKANA is to have one commit for one PR. Two or more commits are in case the two commits are not connected. For example, the second commit is renaming some unrelated tests (too small in order to open a new PR for that). Could you squash your commits and rename the resulting commit? Our new naming guide for commits is:
"Closes #XXXX - bla bla bla"
XXXX is the issue number. This way, the issue gets closed automatically.

Did you adjust assigment of permitted domains? Before this feature, permitted domains were only dependant on groups. I might have overseen this change in the PR.