Add an express cache for graphql

[nygrenh]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.41%. Comparing base (4966ba8) to head (2129006).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1249      +/-   ##
==========================================
- Coverage   66.36%   65.41%   -0.95%     
==========================================
  Files         144      144              
  Lines        6056     6205     +149     
  Branches     1438     1497      +59     
==========================================
+ Hits         4019     4059      +40     
- Misses       1898     2002     +104     
- Partials      139      144       +5     

Flag	Coverage Δ
backend	65.41% <ø> (-0.95%)	⬇️

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