docs: Add ADR for handling frontend plugin fallback

[jsnwesson]

Description:

This ADR is to propose how we should handle the scenario where the iFrame plugin fails to render. The decision here will help with releasing the PR to make iFrame plugins possible in MFEs. (#235)

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (3956276) 83.05% compared to head (4c78b7f) 83.17%. Report is 24 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #541      +/-   ##
==========================================
+ Coverage   83.05%   83.17%   +0.12%     
==========================================
  Files          40       40              
  Lines        1062     1070       +8     
  Branches      195      195              
==========================================
+ Hits          882      890       +8     
  Misses        168      168              
  Partials       12       12              

see 4 files with indirect coverage changes

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[Mashal-m]

Hey, @jsnwesson, could you please pass the failed ci check?