feat: add routing provider dropdown selector#400

rahulkumaar03 wants to merge 1 commit intoProject-OSRM:gh-pagesProject-OSRM/osrm-frontend:gh-pagesfrom

rahulkumaar03:fix/services-provider-select-dropdownrahulkumaar03/osrm-frontend-fix:fix/services-provider-select-dropdownCopy head branch name to clipboard