Fix embed listing

[fiskus]

Add selection provider for embed listing and make selection optional

TODO

• Make Selection.Provider optional. Not sure, it's worth it. It is in 24d8c20, so it's easily revertible
• Changelog entry (skip if change is not significant to end users, e.g. docs only)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 39.35%. Comparing base (b88874c) to head (24d8c20).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...talog/app/containers/Bucket/Selection/Provider.tsx	0.00%	7 Missing ⚠️
...p/containers/Bucket/PackageDialog/S3FilePicker.tsx	0.00%	2 Missing ⚠️
.../app/containers/Bucket/PackageTree/PackageTree.tsx	0.00%	2 Missing ⚠️
catalog/app/containers/Bucket/Dir.tsx	0.00%	1 Missing ⚠️
catalog/app/containers/Bucket/Listing.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4236      +/-   ##
==========================================
- Coverage   39.36%   39.35%   -0.01%     
==========================================
  Files         775      775              
  Lines       35134    35140       +6     
  Branches     5295     5296       +1     
==========================================
  Hits        13829    13829              
- Misses      20739    20745       +6     
  Partials      566      566              

Flag	Coverage Δ
api-python	91.29% <ø> (ø)
catalog	14.70% <0.00%> (-0.01%)	⬇️
lambda	92.02% <ø> (ø)

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[nl0]

(tested)