feat(metadata): add UoM validation to POST deviceresource API

[chr1shung]

fix #4138

Signed-off-by: Chris Hung chris@iotechsys.com

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PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)

Testing Instructions

1. Run metadata from this branch with WRITABLE_UOM_VALIDATION=true environment variable
2. Verify POST /api/v2/deviceprofile/resource API is validating device resource units against uom.toml as expected

New Dependency Instructions (If applicable)

[codecov-commenter]

Codecov Report

Merging #4140 (86addf0) into main (d9dcee9) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #4140      +/-   ##
==========================================
- Coverage   43.65%   43.61%   -0.04%     
==========================================
  Files         121      121              
  Lines       10691    10700       +9     
==========================================
  Hits         4667     4667              
- Misses       5624     5633       +9     
  Partials      400      400              

Impacted Files	Coverage Δ
...ternal/core/metadata/application/deviceresource.go	0.00% <0.00%> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
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[cloudxxx8]

LGTM