Include description and unit fields into outgoing metric packet

[harshitrjpt]

Description

Updated the platform Metric type to include description field.
Included the 'Description' and 'Unit' fields in the final metric packet before it is exported.

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.74%. Comparing base (00d0c6f) to head (62f85b1).
Report is 9 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #306      +/-   ##
==========================================
+ Coverage   26.88%   27.74%   +0.85%     
==========================================
  Files          44       45       +1     
  Lines        4564     3846     -718     
==========================================
- Hits         1227     1067     -160     
+ Misses       3242     2706     -536     
+ Partials       95       73      -22     

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