Acquire bulk readings in JSON format

[amotl]

Coming from #39, this finally implements the acquisition of bulk readings in JSON format.

An example payload is:

[
  {
    "time": 1614534635,
    "temperature": 45.2,
    "humidity": 83.1
  },
  {
    "time": 1614534660,
    "temperature": 45.3,
    "humidity": 83.2
  }
]

cc @valentinbarral

[codecov-commenter]

Codecov Report

Patch coverage: 87.50% and project coverage change: +0.07 🎉

Comparison is base (fa580a6) 52.69% compared to head (5954952) 52.76%.

❗ Current head 5954952 differs from pull request most recent head 510d24c. Consider uploading reports for the commit 510d24c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   52.69%   52.76%   +0.07%     
==========================================
  Files          99       99              
  Lines        5224     5236      +12     
==========================================
+ Hits         2753     2763      +10     
- Misses       2471     2473       +2     

Flag	Coverage Δ
unittests	52.76% <87.50%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
kotori/daq/storage/influx.py	68.13% <85.71%> (+0.70%)	⬆️
kotori/daq/graphing/grafana/dashboard.py	89.45% <88.88%> (-0.19%)	⬇️

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