Add support to include gherkin/feature files within the workspace context

[eamonnfaherty]

Is your feature request related to a problem? Please describe.

When using the /dev syntax within a prompt in Amazon Q Chat, source code within .feature files (gherkin) is not read by the prompt.

Describe the solution you'd like

It would be amazing if the plugin was updated to support gherkin/feature files.

Describe alternatives you've considered

Additional context

If I rename the .feature file extension to .yaml the files are read and processes as desired.

[eamonnfaherty]

I raised #5236