countdown timer implementation using metadata

[rohitsahu]

• Add your
• Specific
• Features or fixes

Resolves: MWPW-NUMBER

Test URLs:

• Before: https://main--milo--adobecom.hlx.page/?martech=off
• After: https://--milo--adobecom.hlx.page/?martech=off

[codecov]

Codecov Report

Attention: Patch coverage is 93.41317% with 11 lines in your changes missing coverage. Please review.

Project coverage is 96.22%. Comparing base (3fd877c) to head (c6cea6a).
Report is 17 commits behind head on stage.

Files with missing lines	Patch %	Lines
libs/features/countdown-timer/countdown-timer.js	93.29%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            stage    #2890      +/-   ##
==========================================
+ Coverage   96.09%   96.22%   +0.12%     
==========================================
  Files         215      238      +23     
  Lines       53954    54409     +455     
==========================================
+ Hits        51849    52355     +506     
+ Misses       2105     2054      -51     

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