Add support for physician type schema

Hi, patch #2 applied cleanly, support for physician type schema is added and also attached a screenshot for reference.
Thankyou.

Moving this to the MedicalEntity submodule, which is the best location for this data type.

Hi @DamienMcKenna,

Thank you for the update. As suggested, I will recreate the patch for the schema that can apply to the Schema.org/MedicalEntity module.

Thanks for the feature add, now rolled in to 2.9 release.

I noticed that when enabling the `schema_pysician` an error is thrown in regards the plugin `memberOf` and `hospital_affiliation` does not exist, this is due the incorrect namespaces in the module pointing to the incorrect `schema_metatag` module, instead I switched to the correct namespaces which is `schema_medical_entity` I have submitted a MR and also a patch to fix this.