TSLint → ESLint (#21006)

* Alphabetized tslint and tsconfig files

* Optimized tsconfig files

* Optimized editorconfig & prettier config files

… to reduce redundancy

* Switched to @grafana/tsconfig

… and:
* de-duped options
* removed options with default values

* Fixed nasty issue with types for nested slate-react

* Replaced TSLint with ESLint

* TSLint disables → ESLint disables

… also JSHint removals, which haven’t had an affect since it was replaced with TSLint.

* Compliances for ESLint, Prettier and TypeScript

* Updated lockfile

packages/grafana-runtime/.eslintrc

@@ -0,0 +1,6 @@
+{
+  "extends": ["@grafana/eslint-config"],
+  "rules": {
+    "no-restricted-imports": [2, "^@grafana/runtime.*"]
+  }
+}