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/specs/timeseries.spec.ts

@@ -0,0 +1,44 @@
+// import _ from 'lodash';
+import ts from '../timeseries';
+
+describe('timeseries processing functions', () => {
+
+  describe('sumSeries()', () => {
+    it('should properly sum series', (done) => {
+      let series = [
+        [[0, 1], [1, 2], [1, 3]],
+        [[2, 1], [3, 2], [4, 3]]
+      ];
+
+      let expected = [[2, 1], [4, 2], [5, 3]];
+
+      let result = ts.sumSeries(series);
+      expect(result).toEqual(expected);
+      done();
+    });
+
+    it('should properly sum series with nulls', (done) => {
+      // issue #286
+      let series = [
+        [[1, 1], [1, 2], [1, 3]],
+        [[3, 2], [4, 3]]
+      ];
+
+      let expected = [[1, 1], [4, 2], [5, 3]];
+
+      let result = ts.sumSeries(series);
+      expect(result).toEqual(expected);
+      done();
+    });
+
+    it('should properly offset metric', (done) => {
+      let points = [[1, 1], [-4, 2], [2, 3]];
+
+      let expected = [[101, 1], [96, 2], [102, 3]];
+
+      let result = ts.offset(points, 100);
+      expect(result).toEqual(expected);
+      done();
+    });
+  });
+});