feat: Add caching to Secrets struct to improve performance

[j03-dev]

Migration notes

• The change comes with new or modified tests
• Hard-to-understand functions have explanatory comments
• End-user documentation is updated to reflect the change

[linear]

MET-584 (CLI) partial secret hydration

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.90%. Comparing base (58d220f) to head (8871983).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #813      +/-   ##
==========================================
- Coverage   69.12%   68.90%   -0.23%     
==========================================
  Files         144      144              
  Lines       16673    16673              
  Branches     1478     1472       -6     
==========================================
- Hits        11526    11488      -38     
- Misses       5121     5159      +38     
  Partials       26       26              

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