Allow JSON schema fetching for `sindri.json` file validation.

See: https://github.com/microsoft/monaco-editor/issues/1331

libs/remix-ui/editor/src/lib/remix-ui-editor.tsx

@@ -858,6 +858,9 @@ export const EditorUI = (props: EditorUIProps) => {
     monacoRef.current.languages.register({ id: 'remix-move' })
     monacoRef.current.languages.register({ id: 'remix-circom' })
 
+    // Allow JSON schema requests
+    monacoRef.current.languages.json.jsonDefaults.setDiagnosticsOptions({enableSchemaRequest: true})
+
     // Register a tokens provider for the language
     monacoRef.current.languages.setMonarchTokensProvider('remix-solidity', solidityTokensProvider as any)
     monacoRef.current.languages.setLanguageConfiguration('remix-solidity', solidityLanguageConfig as any)