Define self reporting tooling data structure

[Relequestual]

There's a good number of tools in the JSON Schema ecosystem. We often get requests to add new tools or update their indicated support or other details.

In order to avoid such updates, defining a data structure for tooling to self report their existance, support, and details, seems like a good idea.

We would need to define the data structure required, and then look for and pull in the data into a single file.

The expectation is that this is only for open source tooling hosted on GitHub. We can look at supporting GitLab and possibly others at a later point in time.

Tis is related to json-schema-org/community#412

Once collected, data can be utilised to augment the JSON Schema website tooling page data, and the JSON Schema Landscape diagram.

Both the website and the landscape repository house their own data at current. It is expected that a transition to the data in this repository would eventually be the single source of truth, but that may take some time. While that is not the case, this data will augment the data in those repositories as is feasable.