add study descriptor tag annotation to `simulation` and `optimisation`

[stap-m]

Description of the issue

add study descriptor tag annotation to simulation and optimisation

Ideas of solution

If you already have ideas for the solution describe them here

Workflow checklist

• I discussed the issue with someone else than me before working on a solution
• I already read the latest version of the workflow for this repository
• The goal of this ontology is clear to me

I am aware that

• every entry in the ontology should have a definition
• classes should arise from concepts rather than from words