* Performance: Standardize lodash imports to use destructured members
Changes lodash imports of the form `import x from 'lodash/x'` to
`import { x } from 'lodash'` to reduce bundle size.
* Remove unnecessary _ import from Graph component
* Enforce lodash import style
* Fix remaining lodash imports
* chore(dashboardsettings): introduce deep-diff for diffing dashboard models
* feat(dashboardsettings): initial commit of diff comparision react migration
* feat(dashboardsettings): wip - use json-source-map and monaco editor
* chore(deps): add react-diff-viewer to package.json
* feat(dashboardsettings): take the simplistic road for diff view
* refactor(dashboardsettings): clean up Version Settings components
* chore: delete angular historyListCtrl code
* refactor(dashboardsettings): styling fixes
* Small color tweaks
* refactor(versionhistory): fix issues around summary text. write tests
* test(versionhistory): add test for jsonDiff
* refactor(versionhistory): cleanup utils and reduce dom elements
* test(versionsettings): add tests for comparision view
* test(versionsettings): finialise tests for version history comparison view
* test(versionsettings): remove debug
Co-authored-by: Torkel Ödegaard <torkel@grafana.com>
