Add separate loader for clincial table
Add separate loader for clincial table

This solves https://github.com/cBioPortal/cbioportal/issues/4993


Former-commit-id: 5723d777be390ea3fd1f86da314eaca0aaf9e3b3
alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend