Add ioc list command

[marcelldls]

When running ec ioc list:

Available IOCs:                    Latest instance:
bl20j-di-phdgn-02                  2023.12.2
bl20j-di-phdgn-03                  2023.11.9
bl20j-di-phdgn-05                  2023.11.9
bl20j-di-phdgn-07                  2023.11.9
bl20j-di-phdgn-08                  2023.11.9
bl20j-mo-brick-06                  2023.12.1

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (5f99ee1) 84.41% compared to head (c3b0a8c) 84.54%.

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #76 +/- ## ========================================== + Coverage 84.41% 84.54% +0.12% ========================================== Files 18 18 Lines 982 990 +8 ========================================== + Hits 829 837 +8 Misses 153 153 ```

:umbrella: View full report in Codecov by Sentry.
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