Add deprecation notice to godog CLI

[vearutop]

🤔 What's changed?

godog, godog build and godog run would issue deprecation warning before proceeding.

Use of godog CLI is deprecated, please use *testing.T instead.
See https://github.com/cucumber/godog/discussions/478 for details.

⚡️ What's your motivation?

A poll in discussions has been active for couple of months already with general consensus in favor of CLI deprecation.
This PR makes the next step to issue a deprecation notice to improve visibility of upcoming change.
There is also chance that deprecation will be canceled if new facts will be present in related discussion.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, documentation etc. without changing behaviour)

♻️ Anything particular you want feedback on?

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

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[codecov]

Codecov Report

Merging #489 (c62c7fe) into main (d45a9aa) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #489   +/-   ##
=======================================
  Coverage   81.69%   81.69%           
=======================================
  Files          27       27           
  Lines        2267     2267           
=======================================
  Hits         1852     1852           
  Misses        316      316           
  Partials       99       99           

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