Add ignore-case option to mepo whereis, update mepo-cd

[mathomp4]

This PR adds a new option to mepo whereis, --ignore-case (or -i). This option, as it says, allows for a user to ignore the case of the component for whereis:

❯ mepo whereis mapl
Traceback (most recent call last):
  File "/Users/mathomp4/bin/mepo", line 17, in <module>
    main()
  File "/Users/mathomp4/mepo/mepo.d/main.py", line 6, in main
    command.run(args)
  File "/Users/mathomp4/mepo/mepo.d/command/command.py", line 11, in run
    cmd_module.run(args)
  File "/Users/mathomp4/mepo/mepo.d/command/whereis/whereis.py", line 15, in run
    verify.valid_components([args.comp_name], allcomps, ignore_case=args.ignore_case)
  File "/Users/mathomp4/mepo/mepo.d/utilities/verify.py", line 23, in valid_components
    _validate_component(component_to_find, all_component_names)
  File "/Users/mathomp4/mepo/mepo.d/utilities/verify.py", line 35, in _validate_component
    raise Exception('Unknown component name [{}]'.format(component))
Exception: Unknown component name [mapl]
❯ mepo whereis -i mapl
src/Shared/@MAPL

The main use of this is in the mepo-cd helper functions/aliases where now a user doesn't need to know the exact case of a component:

❯ pwd
/Users/mathomp4/Models/GEOSgcm-Intel2022.0-NewBaselib/GEOSgcm
❯ mepo-cd geoschem_gridcomp
❯ pwd
/Users/mathomp4/Models/GEOSgcm-Intel2022.0-NewBaselib/GEOSgcm/src/Components/@GEOSgcm_GridComp/GEOSagcm_GridComp/GEOSphysics_GridComp/@GEOSchem_GridComp

[mathomp4]

I broke mepo diff with my first try. Fixed now. 😊