2974 handle missing metadata in plugins

[nicwells]

Fixes BlueBrain/nexus#2974

Description

Fusion plugins rely on resource data conforming to a particular shape. When a plugin is active for a resource we therefore need to validate that the data conforms to our expected shape and present a user-friendly error message when it does not. In order to describe the shape we introduce the use of JSON Schema and the Ajv JSON schema validator package to validate that our data conforms to the shape.

Advantages

• easier and more robust method to check that data conforms to our expected schema
• better error messages to present to users
• better documented - for both users and developers

We implement this for the Video plugin here to validate the technique with the intention of using it in all plugins.

For each plugin:

• define a schema that we expect the data to conform to using JSON Schema. Note that we may have several for a single plugin.
• use the SchemaValidationFallbackContainer component to handle displaying a user-friendly error message when the data does not conform or use the useJsonSchemaValidation hook directly

How has this been tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added necessary unit and integration tests.
• I have added screenshots (if applicable), in the comment section.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (1.8.0-M1@2e668c2). Click here to learn what that means.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             1.8.0-M1    #1064   +/-   ##
===========================================
  Coverage            ?   66.61%           
===========================================
  Files               ?       22           
  Lines               ?      668           
  Branches            ?      144           
===========================================
  Hits                ?      445           
  Misses              ?      223           
  Partials            ?        0           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2e668c2...bfaa8b9. Read the comment docs.