CloudWatch backend return 400 if user input error

[skip ci]

[skip ci]

[skip ci]

[skip ci]

[skip ci]

postgres; escape ssl mode parameter

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