feat(web): sandbox plugin iframe - alpha

[airslice]

Overview

This PR adds experimental sandbox iframe for NLS.
Also can be used in plugin editor with url query ?useCore&useSandbox.

What I've done

• Add useExperimentalSandbox
• Add component SafeIFrame

What I haven't done

How I tested

Which point I want you to review particularly

Memo

[codecov]

Codecov Report

Merging #399 (62449ca) into main (c225652) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 62449ca differs from pull request most recent head 8cb5b57. Consider uploading reports for the commit 8cb5b57 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #399      +/-   ##
==========================================
+ Coverage   35.91%   35.93%   +0.01%     
==========================================
  Files         348      346       -2     
  Lines       31204    30960     -244     
==========================================
- Hits        11207    11125      -82     
+ Misses      18890    18739     -151     
+ Partials     1107     1096      -11     

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see 19 files with indirect coverage changes