Improve type and IDE support

[caendesilva]

Increases type coverage from 98.25% to 99.25% by adding type annotations, generics, and type casts. This not only improves type coverage but also provides better IDE support and may eliminate type related bugs.

Class	Start	End
PostAuthor	90.48%	100%
ConsoleKernel	92.31%	100%
BuildWarnings	91.67%	95.74%
PageCollection	93.10%	96.55%
RssFeedGenerator	93.33%	99.35%
LoadConfiguration	93.62%	95.74%
DocumentationSearchPage	93.33%	100%
Total	98.25%	99.25%

Note that more classes than this are improved, I just haven't noted them in the table.

[codecov]

Codecov Report

Merging #1306 (343fb43) into master (274e82c) will not change coverage.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##              master     #1306     +/-   ##
=============================================
  Coverage     100.00%   100.00%             
- Complexity      1326      2654   +1328     
=============================================
  Files            152       304    +152     
  Lines           3465      6936   +3471     
=============================================
+ Hits            3465      6936   +3471     

Impacted Files	Coverage Δ
...framework/src/Foundation/Kernel/FileCollection.php	100.00% <ø> (ø)
...framework/src/Foundation/Kernel/PageCollection.php	100.00% <ø> (ø)
...ramework/src/Foundation/Kernel/RouteCollection.php	100.00% <ø> (ø)
...Concerns/Internal/ForwardsIlluminateFilesystem.php	100.00% <ø> (ø)
.../Framework/Features/Blogging/Models/PostAuthor.php	100.00% <ø> (ø)
...amework/Features/Navigation/BaseNavigationMenu.php	100.00% <ø> (ø)
...ckages/framework/src/Support/Models/RenderData.php	100.00% <ø> (ø)
...ackages/framework/src/Support/Models/RouteList.php	100.00% <ø> (ø)
...es/framework/src/Console/Commands/DebugCommand.php	100.00% <100.00%> (ø)
...ramework/src/Console/Commands/RouteListCommand.php	100.00% <100.00%> (ø)
... and 12 more

... and 152 files with indirect coverage changes

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