EW-835 provided courses API client and its adapter

[Fshmit]

Description

In this ticket:

1. Added a script (filter-spec.js) to filter the server's docs JSON
2. Added a read me file under common-cartridge-client to describe the usage of the filter of spec
3. Created an API Client by openapi for courses (CoursesApi)
4. Created a client adapter to wrap the CoursesApi
5. Implemented REST call through CoursesApi to get common cartridge metadata of a course from the schulcloud-server
6. Modified the controller, use case and service of common-cartridge and expanded some tests

Links to Tickets or other pull requests

https://ticketsystem.dbildungscloud.de/browse/EW-835

Changes

Datasecurity

Deployment

New Repos, NPM pakages or vendor scripts

Approval for review

• DEV: If api was changed - generate-client:server was executed in vue frontend and changes were tested and put in a PR with the same branch name.
• QA: In addition to review, the code has been manually tested (if manual testing is possible)
• All points were discussed with the ticket creator, support-team or product owner. The code upholds all quality guidelines from the PR-template.

Notice: Please remove the WIP label if the PR is ready to review, otherwise nobody will review it.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud