Variables: Adds variables inspection (#25214)

* Chore: initial commit

* Refactor: adds usages

* Refactor: adds FeatureInfoBox

* Refactor: uses graphs instead

* Refactor: adds id, name, title to prop instead of key

* Refactor: adds usages to VariablesList

* Refactor: Moves unknowns to first page

* Refactor: minor stylings and icons

* Refactor: styling

* Refactor: changed to button with modal

* Refactor: adds VariablesDependenciesButton

* Refactor: changes after UX feedback

* Refactor: renames heading

* Refactor: changes after PR comments

* Refactor: small changes after PR comments

package.json

@@ -288,7 +288,8 @@
     "tinycolor2": "1.4.1",
     "tti-polyfill": "0.2.2",
     "uuid": "8.3.0",
-    "whatwg-fetch": "3.1.0"
+    "whatwg-fetch": "3.1.0",
+    "visjs-network": "4.25.0"
   },
   "resolutions": {
     "caniuse-db": "1.0.30000772"