Add Errformat to ReviewDog

[BinaryHexer]

Currently it seems that Reviewdog doesn't support go-consistent.

Here is the error that Reviewdog spews out:

reviewdog: "goconsistent" is not supported. consider to add new errrorformat to https://github.com/haya14busa/errorformat

While it is possible to workaround this by defining a custom error format for Reviewdog, this is error-prone since whenever the output of the tool changes Reviewdog will fail to parse the output.
For the same reason I think any non-maintainer that tries to make a PR to Reviewdog for adding error format for go-consistent will run into the same concern.

I hope the maintainers of go-consistent will consider this!

[quasilyte]

I'll look into that, thanks. PRs are welcome, by the way.

[jlwt90]

@quasilyte I would like to have this feature too and created a pull request there.
Could you review the error format in this PR?

It doesn't accept error string (only error code) but I think it's good enough for now :)

[jlwt90]

@quasilyte Sorry, if possible, I would like to have your review for this PR:
reviewdog/errorformat#47
Thanks! :)

[quasilyte]

@jlwt90, sorry for the late response, I had hard times finding a free time.

Your PR (although already merged) looks good to me. Thank you.

[quasilyte]

I believe we can close this issue now.

[jlwt90]

@quasilyte No problem! Thank you for your review! 🙇