Feature: remove dependency on @cucumber/cucumber

[vitalets]

The problem
This is an epic issue for removing dependency on @cucumber/cucumber.
As stated in a project roadmap #83, there are several reasons for it:

• changes in Cucumber can break playwright-bdd (as it was in Bug: Tests failing with latest version install due to changes in Cucumber package #80)
• tricky run for ESM: need to pass NODE_OPTIONS: '--loader ts-node/esm --no-warnings' for Cucumber although Playwright handles ESM internally without ts-node
• need to configure importTestFrom manually, impossible to have several test instances (see Feature: support several custom test instances #46)
• performance: each Playwright worker loads full Cucumber package although runner is not used

In general, tracking dependency on such big and active projects like Cucumber and Playwright is a lot of work. Removing one of them is a great achievement, that will free up more time for developing playwright-bdd itself.

A solution
To make the transition backwards compatible, introduce no-cucumber mode.
It is automatically enabled by 2 new config options:

• features - path(s) to feature files (replacement of paths)
• steps - path(s) to step definition files (replacement of require, import, requireModule and importTestFrom)

When using these options, Cucumber will not be involved into files loading process (although may be still imported during transition period). Replaced options will be marked as deprecated, and eventually will be removed from bdd config.

Instead of importing @cucumber/cucumber package, playwright-bdd will depend on particular sub-packages of Cucumber:

• @cucumber/messages
• @cucumber/expressions
• @cucumber/gherkin
• @cucumber/html-formatter
• etc

On the user-land the main change is in cucumber-style syntax. Instead of importing Given / When / Then from @cucumber/cucumber there should be another way to get these functions - tbd.

There are some other points where Cucumber is currently used:

• typings - should be moved directly into playwright-bdd
• snippet syntax - discuss with users, how much is it useful?
• merging config from cucumber.js - should be disabled
• custom parameter types - tbd

More details will appear after deeper investigation.

[vitalets]

Landed in v7 🎉