feat: adds typescript types + type tests

[carsonfarmer]

Depends on multiformats/js-cid#102 for tests to run/work nicely, but this PR is already useful on its own if you don't want to use the tests in CI etc.

[carsonfarmer]

Keeping this as a draft for now, until multiformats/js-cid#102 is (hopefully merged and) released (tho this PR is already useful as is). If you'd rather not have these types in this repo, please let me know @vasco-santos, and I can PR them to definitelytyped instead.

[carsonfarmer]

See libp2p/js-libp2p-crypto#161 for a discussion of the possible applications of these types for CI etc.

[carsonfarmer]

Type checking/tests could be added to CI by adding:

    - stage: types
      script:
        - npm run test:types

[hacdias]

LGTM.

Btw, I see we're adding the types to the repository itself. So, if you want to move the js-multicoded to its repository, please feel free to PR and ping me 😄

[carsonfarmer]

Awesome, any chance we could get a patch release once this is merged 🙏?

P.S. I will indeed ping you if/when I get a chance to update js-multicodec 👍.

[hacdias]

@carsonfarmer thanks. Pinging @vasco-santos since I don't have publish permissions here.

[jacobheun]

LGTM 👍

[jacobheun]

Released in 0.13.7.