RFC: REST Node API

[samuel-rufi]

Rendered

[luca-moser]

• I believe we should rename /transaction-messages to just /transactions. For example, routes like /transaction-messages/by-address include the word messages for no apparent reason.
• post examples still use post- where they should be get-
• Responses should return array of objects instead of objects where each sub object is keyed by the identifier of the particular entity.
• I am not sure whether the peers count in the /info response is useful information.
• The API does not describe any kind of authentication mechanism which I believe at the end we should have, perhaps something simple like a JWT.