[types] Incorrect types for Writer class

[opl-]

In the DefinitelyTyped, the Writer.list types claim it returns an array of quads, and Writer.addQuad types claim it accepts an array of quads, but in reality the first returns a SerializedTerm, and the second serializes a passed in array of named nodes as _:undefined.

Writer.blank also returns a SerializedTerm while being typed as returning a BlankNode.

Writer.end types seem to erroneously claim that it accepts a result: string argument - I imagine this one was supposed to be a type of the ErrorCallback's result argument instead.

N3: https://github.com/rdfjs/N3.js/blob/5a58e93196a5048b6a4c09a1826847a7b811d283/src/N3Writer.js

DefinitelyTyped: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/96890be4669c6d5f25aa2ee1fddf5e9e8a073e36/types/n3/index.d.ts