Support InfluxDB as a history db

[alexanderzobnin]

This PR closes #640 and adds support for InfluxDB as Direct DB Connection datasource along with MySQL and Postgres.

[codecov]

Codecov Report

Merging #641 into master will increase coverage by 1.65%.
The diff coverage is 48.3%.

@@            Coverage Diff             @@
##           master     #641      +/-   ##
==========================================
+ Coverage   30.11%   31.77%   +1.65%     
==========================================
  Files          44       27      -17     
  Lines        2902     2115     -787     
  Branches      514      353     -161     
==========================================
- Hits          874      672     -202     
+ Misses       1813     1215     -598     
- Partials      215      228      +13

Impacted Files	Coverage Δ
...ource-zabbix/zabbix/connectors/sql/sqlConnector.js	2.17% <0%> (-7.35%)	⬇️
src/datasource-zabbix/utils.js	38.98% <100%> (-2.9%)	⬇️
src/datasource-zabbix/config.controller.js	12.5% <16.66%> (-2.5%)	⬇️
src/datasource-zabbix/datasource.js	42.45% <33.33%> (-0.56%)	⬇️
...datasource-zabbix/zabbix/connectors/dbConnector.js	56.81% <61.29%> (-14.02%)	⬇️
...ix/zabbix/connectors/influxdb/influxdbConnector.js	62.74% <62.74%> (ø)
src/datasource-zabbix/zabbix/zabbix.js	15.54% <8.33%> (-14.98%)	⬇️
src/panel-triggers/triggers_panel_ctrl.js	48.9% <0%> (-4.25%)	⬇️
... and 30 more

---

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[codecov]

Codecov Report

Merging #641 into master will increase coverage by 1.65%.
The diff coverage is 48.3%.

@@            Coverage Diff             @@
##           master     #641      +/-   ##
==========================================
+ Coverage   30.11%   31.77%   +1.65%     
==========================================
  Files          44       27      -17     
  Lines        2902     2115     -787     
  Branches      514      353     -161     
==========================================
- Hits          874      672     -202     
+ Misses       1813     1215     -598     
- Partials      215      228      +13

Impacted Files	Coverage Δ
...ource-zabbix/zabbix/connectors/sql/sqlConnector.js	2.17% <0%> (-7.35%)	⬇️
src/datasource-zabbix/utils.js	38.98% <100%> (-2.9%)	⬇️
src/datasource-zabbix/config.controller.js	12.5% <16.66%> (-2.5%)	⬇️
src/datasource-zabbix/datasource.js	42.45% <33.33%> (-0.56%)	⬇️
...datasource-zabbix/zabbix/connectors/dbConnector.js	56.81% <61.29%> (-14.02%)	⬇️
...ix/zabbix/connectors/influxdb/influxdbConnector.js	62.74% <62.74%> (ø)
src/datasource-zabbix/zabbix/zabbix.js	15.54% <8.33%> (-14.98%)	⬇️
src/panel-triggers/triggers_panel_ctrl.js	48.9% <0%> (-4.25%)	⬇️
... and 30 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 612052e...ae32dfb. Read the comment docs.