Eth 2 Endpoints

[kclowes]

What was wrong?

We'll need to add the Eth2 endpoints so that people can access that data. We'll also need good documentation and it would probably be nice to have a tutorial or two.

How can it be fixed?

For the initial pass, @pipermerriam and I talked about making a new provider to access the endpoints and then putting the provider behind a flag much like the enable_unstable_package_management_api flag. The standardized API is found here

[wolovim]

MVP merged in. Work remains for input/output validation, documentation, etc., but we're early to the party, so we'll keep iterating. (Only Teku and Lighthouse support the API so far.)