feat(store-devtools): export private Redux Devtools Extension injecti…

…on token

The injection token REDUX_DEVTOOLS_EXTENSION is currently private and unable to be overriden by any means. This change allows for custom implementations of the devtools extension interface on platforms that are not browser

modules/store-devtools/src/index.ts

@@ -1,6 +1,7 @@
 export { StoreDevtoolsModule } from './instrument';
 export { LiftedState, RECOMPUTE } from './reducer';
 export { StoreDevtools } from './devtools';
+export { REDUX_DEVTOOLS_EXTENSION } from './extension';
 export {
   StoreDevtoolsConfig,
   StoreDevtoolsOptions,