Added fmpy to fmu checker

[ClemensLinnhoff]

Reference to a related issue in the repository

47

Add a description Since the official FMU Compliance Checker by Modelica does not seem to be maintained anymore, we are adding a second validation framework for FMUs: FMPy.

Take this checklist as orientation for yourself, if this PR is ready for Maintainer Review

• [x] My suggestion follows the governance rules.
• [x] All commits of this PR are signed.
• [x] My changes generate no errors when passing CI tests.
• [x] I updated all documentation (readmes incl. figures) according to my changes. (see https://github.com/openMSL/sl-1-5-sensor-model-testing/pull/26)
• [x] I have successfully implemented and tested my fix/feature locally.
• [x] Appropriate reviewer(s) are assigned.

[ClemensLinnhoff]

Both FMU checker found the error in the modelDescription!