[3.x] Make Service::class properties protected

[r-kujawa]

What the diff?

• Enhanced variable accessibility in Account class
  Changed '$serviceConfig' property's visibility from private to protected in multiple files.
• Improved variable accessibility in Provider class
  Updated '$serviceConfig' property's accessibility from private to protected.
• Modified Service class variable's access
  Adjusted the visibility of '$config', '$driver', '$provider', '$account', and '$gateway' from private to protected.
• Increased method accessibility in ThrowsRuntimeException trait
  Updated 'throwRuntimeException' method's access from private to protected.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.13%. Comparing base (a20b983) to head (da6683d).

Files	Patch %	Lines
src/Traits/ThrowsRuntimeException.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #82   +/-   ##
=========================================
  Coverage     92.13%   92.13%           
  Complexity      190      190           
=========================================
  Files            22       22           
  Lines           661      661           
=========================================
  Hits            609      609           
  Misses           52       52           

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