Support capturing groups in Parameter regex (cucumber-rs/cucumber-expressions#7)

[ilslv]

Resolves cucumber-rs/cucumber-expressions#7

Synopsis

Currently cucumber-expresions string parameter regex group leaves quotes.

Solution

Add string_<id> name to a string parameter (cucumber-rs/cucumber-expressions#8) regex capture groups and handle it as a special case in cucumber-codegen crate.

Checklist

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[ilslv]

FCM

Support capturing groups in `Parameter` regex (#204)

- fix `{string}` parameter returning enclosing quotes (cucumber-rs/cucumber-expressions#7)

[tyranron]

@ilslv cucumber-expressions 0.2.0 has been released.

[ilslv]

This PR kinda breaks public API with step::Context::matches now having regex group names in addition to the captured value, so maybe we should release it as 0.12?

[tyranron]

@ilslv sure, we should.