Support code block languages

[alecsammon]

Update the format of adding tools to use the Gherkin type comments:
https://cucumber.io/docs/gherkin/reference/#doc-strings

It's possible to annotate the DocString with the type of content it contains. You specify the content type after the triple quote, as follows:

This replaces @tool with `"""tool"

The .ghokin configuration file remains the same.

This is breaking change due to dropping support for the @ format

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.78%. Comparing base (76edb15) to head (7bd5f16).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #185      +/-   ##
==========================================
+ Coverage   84.51%   84.78%   +0.27%     
==========================================
  Files          14       14              
  Lines         536      539       +3     
==========================================
+ Hits          453      457       +4     
+ Misses         68       67       -1     
  Partials       15       15              

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