[feat] add DoubleQuoteUsage to PhpCsFixer Rule

[alissn]

Hi,

This PR adds the Squiz.Strings.DoubleQuoteUsage rule to PHP_CodeSniffer to enforce single quotes when double quotes are not necessary.

--- Original
+++ New
 <?php

-$a = "sample";
+$a = 'sample';
 $b = "sample with 'single-quotes'";

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 85.95506% with 50 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@c031a54). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/Drivers/Atipay/Core/fn.atipay.php	14.28%	18 Missing ⚠️
src/Drivers/Aqayepardakht/Aqayepardakht.php	42.30%	15 Missing ⚠️
src/Drivers/Behpardakht/Behpardakht.php	0.00%	7 Missing ⚠️
src/Drivers/Zarinpal/Strategies/Sandbox.php	60.00%	6 Missing ⚠️
src/Drivers/Saman/Saman.php	0.00%	2 Missing ⚠️
src/Drivers/Omidpay/Omidpay.php	85.71%	1 Missing ⚠️
src/Drivers/Paypal/Paypal.php	93.75%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #361   +/-   ##
=========================================
  Coverage          ?   79.59%           
  Complexity        ?     1039           
=========================================
  Files             ?       65           
  Lines             ?     5493           
  Branches          ?        0           
=========================================
  Hits              ?     4372           
  Misses            ?     1121           
  Partials          ?        0           

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[khanzadimahdi]

could you please fix the pipeline? it is failing at the moment!

[alissn]

@khanzadimahdi

I was holding this pull request until PR #349 was merged because it contained several changes, to prevent conflicts.

PR #349 has now been merged, so this pull request can be merged as well.