Expose explorer types to ease development of library's consumer.

[benjaminbours]

@fabian-emilius if you can validate this, could be awesome 🙏 Just a small things to expose Typescript types and allow library consumers to build strong typed code around the lib.

[benjaminbours]

@fabian-emilius I realised some types are also incomplete, so in addition to expose them, I am also completing them.

3f4f4cf

[benjaminbours]

@fabian-emilius any update about it? Its really small stuff, it takes only a minute to review this change.

[benjaminbours]

@fabian-emilius? Would like other people to come and help you maintain this repo? I can give you a hand if you allow me to.