Qc curves endpoint

[local-minimum]

And endpoint to request all growth-curve related data for a plate. Request takes roughly 2s.

Updated fixture to reuse fixture files across tests.

[codecov-io]

Codecov Report

Merging #393 into master will increase coverage by 0.16%. The diff coverage is 94.23%.

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
+ Coverage   41.05%   41.22%   +0.16%     
==========================================
  Files         206      207       +1     
  Lines       16948    16999      +51     
  Branches     2953     2954       +1     
==========================================
+ Hits         6958     7007      +49     
+ Misses       9576     9555      -21     
- Partials      414      437      +23

Impacted Files	Coverage Δ
scanomatic/ui_server/ui_server.py	38.8% <0%> (-0.59%)	:arrow_down:
scanomatic/data_processing/analysis_loader.py	100% <100%> (ø)
scanomatic/ui_server/qc_api.py	6.86% <87.5%> (+1.49%)	:arrow_up:
scanomatic/image_analysis/grid.py	75.93% <0%> (-0.76%)	:arrow_down:
scanomatic/data_processing/phases/features.py	17.23% <0%> (ø)	:arrow_up:
scanomatic/ui_server/tools_api.py	8.77% <0%> (ø)	:arrow_up:
scanomatic/qc/phenotype_results.py	0% <0%> (ø)	:arrow_up:
scanomatic/data_processing/phenotyper.py	27.51% <0%> (ø)	:arrow_up:
scanomatic/ui_server/data_api.py	9.65% <0%> (ø)	:arrow_up:
scanomatic/io/source.py	18.08% <0%> (ø)	:arrow_up:
... and 2 more

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[local-minimum]

Frontend is part of integration-task I'm working on.