Embed: load polyfills, bring back prefix filtering, load more

[nl0]

Description

TODO

• Unit tests
• Automated tests (e.g. Preflight)
• Documentation
  • Python: Run build.py for new docstrings
  • JavaScript: basic explanation and screenshot of new features
• Changelog entry

[codecov]

Codecov Report

Merging #2153 (ef87c2f) into master (75cbb6b) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

❗ Current head ef87c2f differs from pull request most recent head 108f12e. Consider uploading reports for the commit 108f12e to get more accurate results

@@            Coverage Diff             @@
##           master    #2153      +/-   ##
==========================================
- Coverage   46.30%   46.29%   -0.02%     
==========================================
  Files         434      434              
  Lines       20618    20624       +6     
  Branches     2431     2432       +1     
==========================================
  Hits         9548     9548              
- Misses      10161    10166       +5     
- Partials      909      910       +1     

Flag	Coverage Δ
api-python	89.78% <ø> (ø)
catalog	16.16% <0.00%> (-0.01%)	⬇️
lambda	93.03% <ø> (ø)

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Impacted Files	Coverage Δ
catalog/app/containers/Bucket/Listing.tsx	0.00% <ø> (ø)
catalog/app/embed/Dir.js	0.00% <0.00%> (ø)

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