feat: add pfRICH gdml from standalone (#379)

### Briefly, what does this PR introduce?
Add the `gdml` pfRICH from the [standalone Geant4
version](https://github.com/alexander-kiselev/pfRICH) from
@alexander-kiselev

### What kind of change does this PR introduce?
- [ ] Bug fix (issue #__)
- [x] New feature (issue #__)
- [ ] Documentation update
- [ ] Other: __

### Please check if this PR fulfills the following:
- [ ] Tests for the changes have been added
- [ ] Documentation has been added / updated
- [ ] Changes have been communicated to collaborators

### Does this PR introduce breaking changes? What changes might users
need to make to their code?
no

### Does this PR change default behavior?
no