Display multiple motds and spinner while getting private key

[i-oden]

Description

Please include the following in this section

• Summary of the changes and the related issue
• Relevant motivation and context
• Any dependencies that are required for this change

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

Please delete options that are not relevant.

• Any dependent changes have been merged and published in downstream modules
• Rebase/merge the branch which this PR is made to
• Product Owner / Scrum Master: This PR is made to the master branch and I have updated the version

Formatting and documentation

• I have added a row in the changelog
• The code follows the style guidelines of this project: Black / Prettier formatting
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Tests

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #511 (d1b1c86) into master (39ff0d9) will increase coverage by 0.63%.
The diff coverage is 58.18%.

@@            Coverage Diff             @@
##           master     #511      +/-   ##
==========================================
+ Coverage   41.44%   42.08%   +0.63%     
==========================================
  Files          29       29              
  Lines        2531     2576      +45     
==========================================
+ Hits         1049     1084      +35     
- Misses       1482     1492      +10     

Impacted Files	Coverage Δ
dds_cli/base.py	42.15% <20.00%> (-0.86%)	⬇️
dds_cli/__main__.py	41.04% <40.00%> (-0.37%)	⬇️
dds_cli/motd_manager.py	100.00% <100.00%> (+25.00%)	⬆️
dds_cli/version.py	100.00% <100.00%> (ø)
dds_cli/exceptions.py	89.13% <0.00%> (+8.69%)	⬆️

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