Enable histograms via flowapi

[greenape]

Closes #1076

I have:

• Formatted any Python files with black
• Brought the branch up to date with master
• Added any relevant Github labels
• Added tests for any new additions
• Added or updated any relevant documentation
• Added an Architectural Decision Record (ADR), if appropriate
• Added an MPLv2 License Header if appropriate
• Updated the Changelog

Description

Taking advantage of the recent change to api permissions.. This enables histograms through flowapi.

[cypress]

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Test summary

43 • 0 • 0 • 0

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Run details

Project	FlowAuth
Status	Passed
Commit	0e6ae3d
Started	Apr 8, 2020 4:08 PM
Ended	Apr 8, 2020 4:10 PM
Duration	01:58 💡
OS	Linux Debian - 8.11
Browser	Electron 80

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[codecov]

Codecov Report

Merging #2059 into master will decrease coverage by 0.09%.
The diff coverage is 83.82%.

@@            Coverage Diff             @@
##           master    #2059      +/-   ##
==========================================
- Coverage   95.40%   95.31%   -0.10%     
==========================================
  Files         209      210       +1     
  Lines        8552     8618      +66     
  Branches      809      814       +5     
==========================================
+ Hits         8159     8214      +55     
- Misses        280      287       +7     
- Partials      113      117       +4     

Flag	Coverage Δ
#autoflow_unit_tests	92.91% <ø> (ø)
#flowapi_unit_tests	82.10% <ø> (ø)
#flowauth_unit_tests	94.74% <ø> (ø)
#flowclient_unit_tests	75.21% <33.33%> (-1.59%)	⬇️
#flowetl_unit_tests	100.00% <ø> (ø)
#flowkit_jwt_generator_unit_tests	100.00% <ø> (ø)
#flowmachine_unit_tests	91.12% <73.21%> (-0.17%)	⬇️
#integration_tests	71.41% <83.82%> (+0.29%)	⬆️

Impacted Files	Coverage Δ
flowclient/flowclient/aggregates.py	94.36% <66.66%> (-5.64%)	⬇️
...machine/core/server/query_schemas/custom_fields.py	74.50% <66.66%> (-2.24%)	⬇️
...e/core/server/query_schemas/histogram_aggregate.py	91.30% <91.30%> (ø)
...ine/core/server/query_schemas/flowmachine_query.py	100.00% <100.00%> (ø)

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