Restructure frontend code to allow for extensions (#4721)

# Description of Changes
Move frontend code into `core` folder and add infrastructure for
`proprietary` folder to include premium, non-OSS features

frontend/src/core/contexts/ToolRegistryContext.tsx

@@ -0,0 +1,30 @@
+import { createContext, useContext } from 'react';
+
+import type {
+  ToolRegistryEntry,
+  ToolRegistry,
+  RegularToolRegistry,
+  SuperToolRegistry,
+  LinkToolRegistry,
+} from '@app/data/toolsTaxonomy';
+import type { ToolId } from '@app/types/toolId';
+
+export interface ToolRegistryCatalog {
+  regularTools: RegularToolRegistry;
+  superTools: SuperToolRegistry;
+  linkTools: LinkToolRegistry;
+  allTools: ToolRegistry;
+  getToolById: (toolId: ToolId | null) => ToolRegistryEntry | null;
+}
+
+const ToolRegistryContext = createContext<ToolRegistryCatalog | null>(null);
+
+export const useToolRegistry = (): ToolRegistryCatalog => {
+  const context = useContext(ToolRegistryContext);
+  if (context === null) {
+    throw new Error('useToolRegistry must be used within a ToolRegistryProvider');
+  }
+  return context;
+};
+
+export default ToolRegistryContext;