Introduce JSON Schemas support

[karreiro]

Is your feature request related to a problem? Please describe.

Introducing support to JSON Schemas would make the usage of this repository smoother. It would also document objects for free and set expectations about the data structures.

Describe the solution you'd like
TBD

Describe alternatives you've considered
TBD

[panoply]

@karreiro

I will likely get through these by next week and currently only objects and filters are supported. For the sake of convenience and because I consume them within the Liquify monorepo they are available in the Liquify Schema submodule.

Feel free to apply or use as a strap reference.

Objects

https://unpkg.com/@liquify/schema/theme-docs/objects.json

CDN: https://unpkg.com/@liquify/schema/theme-docs/objects.json
RAW: https://github.com/panoply/liquify-schema/blob/master/stores/theme-docs-objects.json

Filters

https://unpkg.com/@liquify/schema/theme-docs/filters.json

CDN: https://unpkg.com/@liquify/schema/theme-docs/filters.json
RAW: https://github.com/panoply/liquify-schema/blob/master/stores/theme-docs-filters.json

Tags

TODO

Note 

Because the JSON data structures use array types, it is not possible to simply leverage the integrated $schema prop for inferring the stores within text editors that implement JSON LSP. Folks will need to match stores from within their appropriate editor configs (i.e: workspace settings).