Object level user meta

[fiskus]

• PR mostly consists of type refactoring, specified type for object-level metadata in model/index.ts and re-used everywhere
• Small change in EditFileMeta, where I get only user_meta
• Docs change is small, and it will be visibly small after Resolve lint issues in "Working with the Catalog" #3338 merge

• Documentation
• Changelog entry (skip if change is not significant to end users, e.g. docs only)

[codecov]

Codecov Report

Merging #3337 (ec16c82) into master (3ff3f25) will increase coverage by 8.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3337      +/-   ##
==========================================
+ Coverage   27.28%   35.31%   +8.02%     
==========================================
  Files         626      671      +45     
  Lines       25288    29295    +4007     
  Branches     4338     4341       +3     
==========================================
+ Hits         6901    10346    +3445     
- Misses      17216    17777     +561     
- Partials     1171     1172       +1     

Flag	Coverage Δ
api-python	90.79% <ø> (+0.03%)	⬆️
catalog	8.97% <0.00%> (-0.01%)	⬇️
lambda	86.05% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...p/containers/Bucket/PackageDialog/EditFileMeta.tsx	0.00% <0.00%> (ø)
...app/containers/Bucket/PackageDialog/FilesInput.tsx	0.00% <0.00%> (ø)
...og/app/containers/Bucket/PackageDialog/Uploads.tsx	0.00% <ø> (ø)
catalog/app/model/index.ts	0.00% <ø> (ø)
lambdas/s3select/tests/test_s3select.py	100.00% <0.00%> (ø)
lambdas/es/indexer/test/test_read_notebook.py	100.00% <0.00%> (ø)
lambdas/shared/t4_lambda_shared/utils.py	97.40% <0.00%> (ø)
lambdas/preview/src/t4_lambda_preview/__init__.py	98.23% <0.00%> (ø)
lambdas/es/indexer/__init__.py	100.00% <0.00%> (ø)
lambdas/s3hash/setup.py	0.00% <0.00%> (ø)
... and 41 more

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[fiskus]

Reverted docs changes because related PR #3338 diverged significantly. So, I left only necessary changes in docs.