Add public info endpoint

[damip]

Need

• after discussing with Compound, there needs to be a way to store multiple custom elements:
  • addresses of the provider operator on multiple blockchains for providers to receive rewards from users (eg. liquity-style)

Solution

All those needs can be easily solved with a single solution.

On deweb providers, add a /__deweb_info endpoint (available on all subdomains) that returns a JSON:

{
    "app": "deweb",
    "version": ...,
    "misc": ...
}

Version contains the version number of the deweb provider.
And "misc" contains a raw json put in the JSON config file in the "misc_public_info" section.

[0xB19]

@damip Why must the endpoint be available on all sub-domains?

[damip]

@damip Why must the endpoint be available on all sub-domains?

Because:

• immutable sites can't do cross-site queries so the endpoint needs to be on the same domain as themselves
• sites should access it easily through /__deweb_info
• in the future we might add site-specific info to the json, such as the address of the site SC

[damip]

@thomas-senechal ping for review :)

[damip]

Let's finish this

[damip]

@peterjah @fleandrei