Add a jsonschema for charmcraft.yaml in jsonstore

[facundobatista]

The idea is that editors could retrieve automatically the schema from the json schema store and validate that charmcraft.yaml makes sense.

[sed-i]

@lengau, with the unified charmcraft.yaml this would make a lot of sense!
This would also obviate juju/charm#370.

[lengau]

I agree! We're migrating the full charmcraft.yaml description to pydantic models, after which we should be able to automatically generate the JSON schema. This will need some additional work in craft-parts as well, but that work would also be reusable

[lengau]

Note to the implementer, this would include:

1. Changes to automatically generate the schema in an appropriate place (possibly in CI, possibly on release?
2. creating the schema and PRing a relevant change to the schema store. See: Add snapcraft to the catalog SchemaStore/schemastore#668

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-2806.

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