Datasource for Grafana logging platform

Karma to Jest: graph_ctrl

Added #12597

Interval and range in query template variable

Add range to scopedVars

Add basic tests and extract function for range vars

Add support for range query variable in createQuery

Template vars squash

[skip ci]

Add Polish złoty to currency formatters

Id validation of CloudWatch GetMetricData

migrated jquery.flot.events to ts

CloudWatch GetMetricData support

- new builtin datasource plugin "Logging" (likely going to be renamed)
- plugin implements no panel ctrls yet, only ships datasource
- new models for logging data as first class citizen (aside from table
  and time_series model)
- Logs as new view for Explore
- JSON view for development

Testable only against existing logish deployment.
Then test with queries like `{job="..."} regexp`.

Make prometheus value formatting more robust

- In 0425b477 the labels suggestions were refactored and a typo broke
  the look up for available lables of a metric

Use url params for explore state

Dont parse empty explore state from url

* get id from path param when updating a playlist

* add playlist http api documentation

* remove required condition for the id in update cmd

Explore: calculate query interval based on available width

- classic dashboard panels inject a dynamic query interval as part of
  the query options. Explore did not have that.
- this PR adds the interval calculation to Explore
- interval based on Explore container's width
- ensure min interval if set in datasource

- putting state in the path components led to 400 on reload
- use `/explore?state=JSON` instead