implementation of additional properties of Bioschemas profiles

[abotzki]

Is your feature request related to a problem? Please describe.
We have observed that in the release of the Bioschemas profiles additional properties like e.g. 'teaches' for TrainingMaterial are present which might not be parsed by the current Bioschemas parser.

Describe the solution you'd like
Add code to parse such content and store it into e.g. the learning objective field.

Describe alternatives you've considered
Such information (learning objective) could be added manually after scraping, need for locking the field subsequently to prevent removal of such manually added content