[2.x] Change NavItem class API to be fluent instead of readonly

[caendesilva]

This is part of HydePHP v2.x via #1568

A breaking change here is that the NavItem properties are no longer public. Instead they must be used through (already existing) accessors. While this adds extra boilerplate and inconvenience, it also allows us to open up the class data to being edited, the reason we protect the properties is so that we can control the data being added for a consistent and predictable state.

How to upgrade:

Simply replace any usage where you manually called a property with its accessor. (see the file diff for an example)

use Hyde\Framework\Features\Navigation\NavItem;

$item = new NavItem();

$item->destination => $item->getDestination(); 
$item->label => $item->getLabel(); 
$item->priority => $item->getPriority(); 
$item->group => $item->getGroup(); 
$item->children => $item->getChildren(); 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b018e7d) 100.00% compared to head (482ac8a) 100.00%.

Additional details and impacted files

@@                        Coverage Diff                        @@
##             improved-navigation-internals     #1574   +/-   ##
=================================================================
  Coverage                           100.00%   100.00%           
- Complexity                            1761      1762    +1     
=================================================================
  Files                                  184       184           
  Lines                                 4767      4769    +2     
=================================================================
+ Hits                                  4767      4769    +2     

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