[context] consider using context to pass more than just avenger instance

[giogonzo]

requirements

currently we rely on avenger instance being provided via context,
but we require "all queries" and "all commands" to be passed at configuration time

this requires each project to re-export declareQueries and declareCommands configured/partially applied, and this is cumbersome

e.g.

// re-export.js
import allQueries from './queries';
import declareQueries from 'react-avenger/queries';
export default declareQueries(allQueries);

// components
import declareConnect from './re-export.js';

specs

consider the possibility of passing them via context instead

misc

{optional: other useful info}

[giogonzo]

problem: if we pass stuff through context we loose the ability to access queries.Type (or commands.Type) statically