List external driver tasks

[maddenp-cu]

Synopsis

Make --task switch on uw execute mode optional and, when it is omitted, list the tasks made available by the driver indicated by --module and --classname. Additionally, if --task is specified but names a task not provided by the driver, report that and show the tasks that are available.

For example, from the EAGLE repo:

$ uw execute --module eagle/grids_and_meshes.py --classname GridsAndMeshes
...
[2026-01-09T00:25:56]    ERROR Available tasks:
[2026-01-09T00:25:56]    ERROR   combined_global_and_conus_meshes
[2026-01-09T00:25:56]    ERROR     The combined global and CONUS meshes.
[2026-01-09T00:25:56]    ERROR   conus_data_grid
[2026-01-09T00:25:56]    ERROR     The CONUS data grid.
[2026-01-09T00:25:56]    ERROR   global_data_grid
[2026-01-09T00:25:56]    ERROR     The global data grid.
[2026-01-09T00:25:56]    ERROR   provisioned_rundir
[2026-01-09T00:25:56]    ERROR     The provisioned run directory.
[2026-01-09T00:25:56]    ERROR   validate
[2026-01-09T00:25:56]    ERROR     Validate the UW driver config.

Type

• Enhancement (adds new functionality)

Impact

• This is a non-breaking change (existing functionality continues to work as expected)

Checklist

• I have added myself and any co-authors to the PR's Assignees list.
• I have reviewed the documentation and have made any updates necessitated by this change.