Add PagingOptions.IncludeNodesField option

[tobias-tengler]

This PR adds a new IncludeNodesField option on the PagingOptions that allows to turn off the generation of the nodes field on the Connection type.

The nodes fields is mostly for convenience, but it becomes a bit bothersome when using the Relay client and unexperienced Frontend developers. Some of the things that can go wrong and why it might be a good idea to disable the nodes field:

• Developers selecting both the edges and nodes field from different fragments, leading to double the amount of data being returned
• If nodes is being used, Relay can't delete stuff from the list automatically, because it doesn't "know" about the nodes field

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.81%. Comparing base (277615a) to head (52a6e1b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7396      +/-   ##
==========================================
- Coverage   78.87%   77.81%   -1.06%     
==========================================
  Files        2433     2813     +380     
  Lines      119831   140968   +21137     
==========================================
+ Hits        94511   109688   +15177     
- Misses      25320    31280    +5960     

Flag	Coverage Δ
unittests	77.81% <100.00%> (-1.06%)	⬇️

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