feat: add fastly support, fixes #19

[shyim]

When a config/fastly folder exists and FASTLY_API_TOKEN and FASTLY_SERVICE_ID env are existing we are syncing them into the Fastly Service. (The config/fastly folder will be created using recipe).

It does basically the same as our bash script with Fastly CLI. In PHP it's feels more stable and we have more control over it.

Additional to that we have now commands:

• shopware-deployment-helper fastly:snippets:list

• shopware-deployment-helper fastly:snippets:remove <name> to remove a specific one

• Try out that the old tool does not colidate with this new one

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (bc86fb6) to head (99d81ad).

Additional details and impacted files

@@            Coverage Diff             @@
##              main       #23    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           22        28     +6     
  Lines          418       548   +130     
==========================================
+ Hits           418       548   +130     

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