feat: add comment for getMeasurement function

[NguyenHoangSon96]

Proposed Changes

• Add comments to warn user that getMeasurement() function will return null when querying with SQL Query.
• Reference Link.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.14%. Comparing base (dd371d8) to head (0091fb0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #251   +/-   ##
=======================================
  Coverage   90.14%   90.14%           
=======================================
  Files          20       20           
  Lines        1207     1207           
  Branches      188      188           
=======================================
  Hits         1088     1088           
  Misses         42       42           
  Partials       77       77           

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