🐛 properly escape single quote in cURL interceptor output

[techouse]

I noticed that a single quote ' is not properly escaped in the cURL output so I escaped it according to this.

For example

final fakeRequest = Request(
  'POST',
  Uri.parse('/'),
  Uri.parse('base'),
  body: r"""Lorem's ipsum "dolor" sit amet""",
);

should generate this cURL output

curl -v -X POST -H 'content-type: text/plain; charset=utf-8' -d 'Lorem'\''s ipsum "dolor" sit amet' 'base/'

and not fail when you paste it into your shell or Postman.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.38%. Comparing base (7a1f7c2) to head (04daf80).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #635   +/-   ##
========================================
  Coverage    93.38%   93.38%           
========================================
  Files           21       21           
  Lines          499      499           
========================================
  Hits           466      466           
  Misses          33       33           

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