Add a NavItem::toRoute() helper

[caendesilva]

Fixes #215

[codecov]

Codecov Report

Merging #216 (f536688) into master (421f9a8) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master      #216   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       808       810    +2     
===========================================
  Files            103       103           
  Lines           2072      2074    +2     
===========================================
+ Hits            2072      2074    +2     

Impacted Files	Coverage Δ
packages/framework/src/Models/NavItem.php	100.00% <100.00%> (ø)

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