(feat): add secondary ordering by post_title for menu_order

[SimonvanWijhe]

If posts are ordered by menu_order, posts with the same order should be ordered alphabatically.

Before:

After:

[github-actions]

Coverage report for commit: 6a6f19d
File: coverage.xml

Cover ┌─────────────────────────┐ Freq.
   0% │ ███████████████████████ │ 50.0%
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  40% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  50% │ ██████░░░░░░░░░░░░░░░░░ │ 12.5%
  60% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  70% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  80% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  90% │ ██████░░░░░░░░░░░░░░░░░ │ 12.5%
 100% │ ████████████░░░░░░░░░░░ │ 25.0%
      └─────────────────────────┘
 *Legend:* █ = Current Distribution 

Summary - Lines: 27.98% | Methods: 58.70%

Files	Lines	Methods	Branches
src/Block
Block.php	-	-	100.00%
BlockAttributes.php	93.18%	96.15%	100.00%
src/Casts
IntCast.php	50.00%	-	100.00%
src/Query
PostQuery.php	-	-	100.00%
QueryInterface.php	100.00%	100.00%	100.00%
src
QueryBlockServiceProvider.php	-	-	100.00%
src/Traits
Helpers.php	100.00%	100.00%	100.00%
VersionRetriever.php	-	-	100.00%

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