Added Navigation Model to IWeb

[MathijsVerbeeck]

Added base functionalities for #212

Web:

• Add navigation nodes to the top navigation and quicklaunch
• Delete all navigation nodes
• Add child nodes
• Move child nodes after a specific child node
• Update existing navigation node

[codecov-commenter]

Codecov Report

Merging #805 (677a376) into dev (63545f3) will increase coverage by 0.88%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #805      +/-   ##
==========================================
+ Coverage   82.42%   83.30%   +0.88%     
==========================================
  Files         416      473      +57     
  Lines       28590    32496    +3906     
==========================================
+ Hits        23565    27071    +3506     
- Misses       5025     5425     +400     

Impacted Files	Coverage Δ
...re/Model/SharePoint/Changes/Internal/ChangeUser.cs	0.00% <0.00%> (-100.00%)	⬇️
...odel/Security/Internal/SharePointUserCollection.cs	78.78% <0.00%> (-21.22%)	⬇️
....Core/Exceptions/MicrosoftGraphServiceException.cs	80.00% <0.00%> (-20.00%)	⬇️
...PnP.Core.Admin/Model/Teams/Internal/TeamCreator.cs	76.19% <0.00%> (-14.29%)	⬇️
src/sdk/PnP.Core/Services/Core/TestManager.cs	54.94% <0.00%> (-12.96%)	⬇️
.../SharePoint/Core/Internal/ContentTypeCollection.cs	87.67% <0.00%> (-12.33%)	⬇️
.../Model/SharePoint/Core/Internal/ListItemVersion.cs	66.66% <0.00%> (-11.12%)	⬇️
...e/Model/SharePoint/Core/Internal/ListCollection.cs	82.12% <0.00%> (-9.09%)	⬇️
...P.Core/Services/Core/CSOM/Utils/CSOMFieldHelper.cs	80.61% <0.00%> (-7.81%)	⬇️
...nP.Core/Model/Security/Internal/SharePointGroup.cs	61.97% <0.00%> (-6.28%)	⬇️
... and 131 more

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[jansenbe]

Awesome work @MathijsVerbeeck !! Thanks for helping out growing PnP Core SDK 💪

[matsla]

@jansenbe when will the added navigation model to IWeb be released?

[jansenbe]

@matsla , soon I hope, will try to process this one over the weekend or early next week.

[jansenbe]

@MathijsVerbeeck : just merged this nicely implemented PR, well done! Thanks 🚀💪👍