Update Gherkin to use Messages DTOs instead of plain ruby hashes

[aurelien-reeves]

Requires #1601 to be merged first
Refs. #1559

[luke-hill]

@aurelien-reeves after merging this, can we cut a new version of gherkin so I can then get my PR updated in the regular cucumber-ruby

[aurelien-reeves]

@aurelien-reeves after merging this, can we cut a new version of gherkin so I can then get my PR updated in the regular cucumber-ruby

That's the plan
But it is not finished yet.

We have to write a json serializer for those DTOs
And to check the compatibility of all the modules with those new messages and gherkin.

But it is going well at the moment :)

[aslakhellesoy]

Isn't JSON.stringify(envelope) enough?

[aurelien-reeves]

Isn't JSON.stringify(envelope) enough?

This is not javascript, this is ruby

[aurelien-reeves]

Once #1605 is merged, I'll be able to continue on this one. Hopefully there won't be too much to do to make it pass.

[aurelien-reeves]

If no objection soon, I'll force-merge it to be able to start releasing new versions of some modules in the mono-repo

If any objection, I'll wait for proper reviews :)

[aslakhellesoy]

LGTM!