feat: improve type declaration for errors

[arthurfiorette]

This PR extends #146, as I would like to merge this as quickly as possible, I also added requested type tests and jsdoc.

This also adds exports to 3 types inside lib/httpError: HttpErrorCodes, HttpErrorNames and HttpErrors.

Thanks :)

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[gurgunday]

lgtm

[arthurfiorette]

Hey @gurgunday, is there anything else needed to merge this PR?

[gurgunday]

I restrain from merging type PRs without 2 approvals 😁

I’ll request another review

[Fdawgs]

Thanks for the PR.

Can you please rewrite the JSDoc description to not use 'you'?
See our style guide here. :)

[arthurfiorette]

@Fdawgs done! I also updated examples regarding schema id to use camel case HttpError type, which is the usual standard.

[mcollina]

Code still LGTM @Fdawgs are you ok with the change?