Change Details

- cran: Add loader implementation - cran: Migrate cran loader to its own namespace - cran: Add task Related T2026

which means: - add loader implementation with cli auto-registration (`swh loader cran -h`) - add task implementation with scheduler task auto-registration (task-type `load-cran`) - tested Related T2026

- cran: Add loader implementationwhich means: - cran: Migrate cran loader to its own namespaceadd loader implementation with cli auto-registration (`swh loader cran -h`) - add task implementation with scheduler task auto-registration (task-type `load-cran`) - cran: Add task- tested Related T2026