Removed graph side menu

removed side menu from display options, kept overrides in display options, moved thresholds and time regions to its own section in visualization

Explore: Logging line parsing and field stats

Explore: graphInterval needs to update after query execution 

Prometheus: Make result transformer more robust for empty responses

- some prometheus-compatible backends may return `null` instead of empty lists
- test for lists before iterating
- added tests for empty responses

Update react panel header when changing angular panel settings 

Fix quota updating

Lazily parse lines and display stats for field when clicked on.

- log line parsers for JSON (basic), and logfmt
- delayed parsing in case user moves to other line
- reuse label stats for field stats

Pickers with min-width instead of width

Explore logs styling

Multi button group

Explore: improve error handling

Improve PostgreSQL Query Editor if using different Schemas

more detailed error message for loki