feat: Add ability to detect patches which are present in a file

[zarwan-translate]

Greetings 👋

I have a use case where I won't know in advance which patches are available within a template.

This PR adds functionality to traverse a document looking for handlebars and returning the patches found.

[zarwan-translate]

@dolanmiu - For some reason, I was unable to add you as a reviewer. Are you able to take a look at this PR, please?

[dolanmiu]

Looking, thank you

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (022b25c) to head (6a7890f).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2633   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          280       281    +1     
  Lines        14048     14081   +33     
  Branches      1369      1378    +9     
=========================================
+ Hits         14048     14081   +33     

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