Improve serializer performance

[bkoelman]

Improve performance of response serialization for large number of included resources.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

Merging #1265 (feb040f) into master (d2e321c) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head feb040f differs from pull request most recent head 5dd256f. Consider uploading reports for the commit 5dd256f to get more accurate results

@@            Coverage Diff             @@
##           master    #1265      +/-   ##
==========================================
- Coverage   92.69%   92.67%   -0.02%     
==========================================
  Files         243      243              
  Lines        7813     7814       +1     
==========================================
  Hits         7242     7242              
- Misses        571      572       +1     

Impacted Files	Coverage Δ
...e/Serialization/Response/ResourceObjectTreeNode.cs	82.65% <100.00%> (-0.86%)	⬇️

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[bkoelman]

@maurei this was requested by Erik, I'm awaiting feedback if this solves his problem.

[ebryn]

@bkoelman This makes a huge difference! We can now fetch 250k rows in 24 seconds. It took an hour previously. Thanks!

[ebryn]

@bkoelman Would it be possible to have a release with this change published?

[bkoelman]

Yes, I was already preparing for that. There's a few more things I'd like to get in, probably somewhere next week.