Added array return type to _getSidebarNavigation()

[pgunsolley]

Custom menu configuration can accept an array: https://crud-view.readthedocs.io/en/latest/general-configuration/sidebar-navigation.html

Added array return type for _getSidebarNavigation solves invalid return type error when using config array.

[codecov]

Codecov Report

❌ Patch coverage is 36.36364% with 14 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (dev@21af8d0). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/Listener/ViewListener.php	0.00%	8 Missing ⚠️
src/View/Helper/CrudViewHelper.php	0.00%	4 Missing ⚠️
src/Listener/Traits/SidebarNavigationTrait.php	0.00%	1 Missing ⚠️
src/View/Widget/DateTimeWidget.php	66.66%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             dev     #345   +/-   ##
======================================
  Coverage       ?   26.34%           
  Complexity     ?      323           
======================================
  Files          ?       22           
  Lines          ?     1044           
  Branches       ?        0           
======================================
  Hits           ?      275           
  Misses         ?      769           
  Partials       ?        0           

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