support different rule implementations

[ssube]

While the base SchemaRule can do a lot, future rules may need more logic or use a different kind of schema. This will be especially important with #6 and external rules.

Wire up DI through https://github.com/ssube/noicejs and await container.create(rule.type) should solve that neatly. Rule modules can provide DI modules if they have additional Parser or Rule classes.