Prepopulate date

[fiskus]

Treat pre-population of dates as an extension for pre-population of defaults.

When schema has default keyword, its value is used instead of undefined.
When schema has { format: 'date', dateformat: 'yyyy-MM-dd' }, the current date is used instead of undefined.

Implementation:

• Add visual placeholders for defaults and dates
• Prepopulate defaults and default dates on metadata submit

Additional work:

• Convert json-schema.js to Typescript
• Replace Ajv({ useDefaults: true }) with custom implementation because we need to assign dates too

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Besides type conversion I added functions scanSchemaAndPrefillValues, getDefaultValue and replaced makeSchemaDefaultsSetter

• Unit tests
• Automated tests (e.g. Preflight)
• Documentation
  • JavaScript: basic explanation and screenshot of new features
• Changelog entry

[codecov]

Codecov Report

Merging #2121 (60e67ca) into master (93d30c9) will increase coverage by 0.03%.
The diff coverage is 55.85%.

@@            Coverage Diff             @@
##           master    #2121      +/-   ##
==========================================
+ Coverage   46.16%   46.20%   +0.03%     
==========================================
  Files         429      429              
  Lines       20458    20487      +29     
  Branches     2385     2413      +28     
==========================================
+ Hits         9445     9465      +20     
- Misses      10049    10062      +13     
+ Partials      964      960       -4     

Flag	Coverage Δ
api-python	89.69% <ø> (ø)
catalog	16.28% <55.85%> (+0.12%)	⬆️
lambda	92.87% <ø> (ø)

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

Impacted Files	Coverage Δ
catalog/app/utils/json-schema/json-schema.ts	53.00% <53.00%> (ø)
catalog/app/components/JsonEditor/State.js	53.93% <75.00%> (+0.48%)	⬆️
.../containers/Bucket/PackageDialog/PackageDialog.tsx	26.42% <100.00%> (ø)

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[nl0]

looks good, some minor comments inline