Convert iframe plugin to class-based registration pattern

[cdrini]

No description provided.

[cdrini]

Auto-merging, small refactor.

[codecov]

Codecov Report

❌ Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.64%. Comparing base (44d6d54) to head (019e2b1).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/plugins/plugin.iframe.js	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1572      +/-   ##
==========================================
+ Coverage   63.61%   63.64%   +0.03%     
==========================================
  Files          68       68              
  Lines        6206     6206              
  Branches     1378     1378              
==========================================
+ Hits         3948     3950       +2     
+ Misses       2219     2217       -2     
  Partials       39       39              

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.