Add gherkin_lint task

[saidatom]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Documented?	yes

gherkin-lint-php might be easier to set up and configure, especially if you only need basic Gherkin linting.

New Task Checklist:

• [x] Are the dependencies added to the composer.json suggestions?
• [x] Is the doc/tasks.md file updated?
• [x] Are the task parameters documented?
• [x] Is the task registered in the tasks.yml file?
• [x] Does the task contains phpunit tests?
• [x] Is the configuration having logical allowed types?
• [x] Does the task run in the correct context?
• [x] Is the run() method readable?
• [x] Is the run() method using the configuration correctly?
• [x] Are all CI services returning green?

[veewee]

We notices this PR became inactive. If you wish to continue, feel free to pick it up again. If not, we will be closing this PR soon. Thanks for your understanding.