Build plugin with grafana toolkit (#1539)

* Use grafana toolkit template for building plugin

* Fix linter and type errors

* Update styles building

* Fix sass deprecation warning

* Remove empty js files produced by webpack building sass

* Fix signing script

* Replace classnames with cx

* Fix data source config page

* Use custom webpack config instead of overriding original one

* Use gpx_ prefix for plugin executable

* Remove unused configs

* Roll back react hooks dependencies usage

* Move plugin-specific ts config to root config file

* Temporary do not use rst2html for function description tooltip

* Remove unused code

* remove unused dependencies

* update react table dependency

* Migrate tests to typescript

* remove unused dependencies

* Remove old webpack configs

* Add sign target to makefile

* Add magefile

* Update CI test job

* Update go packages

* Update build instructions

* Downgrade go version to 1.18

* Fix go version in ci

* Fix metric picker

* Add comment to webpack config

* remove angular mocks

* update bra config

* Rename datasource-zabbix to datasource (fix mage build)

* Add instructions for building backend with mage

* Fix webpack targets

* Fix ci backend tests

* Add initial e2e tests

* Fix e2e ci tests

* Update docker compose for cypress tests

* build grafana docker image

* Fix docker stop task

* CI: add Grafana compatibility check

src/datasource/query_help.md

@@ -0,0 +1,35 @@
+#### Max data points
+Override max data points, automatically set to graph width in pixels. Grafana-Zabbix plugin uses maxDataPoints parameter to consolidate the real number of values down to this number. If there are more real values, then by default they will be consolidated using averages. This could hide real peaks and max values in your series. Point consolidation will affect series legend values (min,max,total,current).
+
+#### Query Mode
+##### Merics
+Data from numeric items.
+
+##### Text
+Data from items with `Character`, `Text` or `Log` type.
+
+##### IT Services
+Time series representation of IT Services data
+###### IT service property
+Zabbix returns the following availability information about IT service:
+- Status - current status of the IT service
+- SLA - SLA for the given time interval
+- OK time - time the service was in OK state, in seconds
+- Problem time - time the service was in problem state, in seconds
+- Down time - time the service was in scheduled downtime, in seconds
+
+##### Item ID
+Data from items with specified ID's (comma separated). 
+This mode is suitable for rendering charts in grafana by passing itemids as url params. 
+1. Create multivalue template variable with type _Custom_, for example, `itemids`.
+1. Create graph with desired parameters and use `$itemids` in _Item IDs_ filed.
+1. Save dashboard.
+1. Click to graph title and select _Share_ -> _Direct link rendered image_.
+1. Use this URL for graph png image and set `var-itemids` param to desired IDs. Note, for multiple IDs you should pass multiple params, like `&var-itemids=28276&var-itemids=28277`.
+
+##### Triggers
+Active triggers count for selected hosts or table data like Zabbix _System status_ panel on the main dashboard.
+
+#### Documentation links:
+
+[Grafana-Zabbix Documentation](https://alexanderzobnin.github.io/grafana-zabbix)