Modularizes Queryable and SparqlQueryable interfaces

[jacoscaz]

EDIT: I should premise that this PR builds on the feature/query branch, for which there is already an open PR at https://github.com/rdfjs/types/pull/30 .

This PR was inspired by @tpluscode's feedback as discussed on Gitter.im. The goal is to break down Queryable and SparqlQueryable into simpler, more modular interfaces that can be combined without loss in expressivity. I've opted to break them down based on query type (string vs. Algebra).

Example of what becomes possible with this PR:

import { 
  StringSparqlQueryable, 
  AlgebraSparqlQueryable, 
  StringQueryable, 
  AlgebraQueryable,
  BindingsResultSupport,
  QuadsResultSupport,
  QuerySourceContext,
  QueryStringContext,
  QueryAlgebraContext,
 } from './query/queryable';

interface SourceType {
  answer: 42;
}

type EngineType = StringSparqlQueryable<
  QuadsResultSupport & BindingsResultSupport,
  QueryStringContext & QueryAlgebraContext & QuerySourceContext<SourceType>,
> & AlgebraSparqlQueryable<
  QuadsResultSupport & BindingsResultSupport,
  QueryAlgebraContext & QuerySourceContext<SourceType>,
>;

const query = await ({} as EngineType).queryBindings({}, { sources: [{ answer: 42 }] });

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[jacoscaz]

@rubensworks I did a small amount of manual testing to verify whether methods get correctly overloaded across interfaces but this could definitely do with more testing. Might be a good starting point for actual type tests, as per @tpluscode's comment in the other PR. I was waiting for preliminary feedback before committing further effort.

[rubensworks]

Might be a good starting point for actual type tests, as per @tpluscode's comment in the other PR. I was waiting for preliminary feedback before committing further effort.

Yep, I'm already working on those as we speak in #30