Add '--dry-run' option for 'ceremony' and 'sign' commands

[MVrachev]

Description

The '--dry-run' option scope is regarding the command output. This means that when the option is used it will not influence the input options. Instead, it will directly interfere with the output. If '--dry-run' is used, then the CLI will ignore both '--api-server' admin option and the RSTUF configuration file and its corresponding SERVER option.

Signed-off-by: Martin Vrachev martin.vrachev@broadcom.com

Related to #533.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality not to work as expected)

Additional requirements

• [x] Tests have been added for the bug fix or new feature
• [x] Docs have been added for the bug fix or new feature

Code of Conduct

By submitting this PR, you agree to follow our Code of Conduct.

• [x] I agree to follow this project's Code of Conduct

[codecov[bot]]

Codecov Report

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

Project coverage is 98.96%. Comparing base (47d0a69) to head (1c99491). Report is 110 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #630 +/- ## ========================================== + Coverage 98.90% 98.96% +0.06% ========================================== Files 20 30 +10 Lines 1367 1936 +569 ========================================== + Hits 1352 1916 +564 - Misses 15 20 +5 ```

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