feat(nm): export the hoist function (#4951)

* feat(nm): export the hoist function

* style: fix

Author: zkochan

.yarn/versions/9fb28ef8.yml

@@ -0,0 +1,6 @@
+releases:
+  "@yarnpkg/nm": minor
+
+declined:
+  - "@yarnpkg/plugin-nm"
+  - "@yarnpkg/pnpify"

packages/yarnpkg-nm/sources/index.ts

@@ -19,3 +19,6 @@ export {
 };
 
 export type {NodeModulesLocatorMap};
+
+export type {HoisterTree, HoisterResult} from './hoist';
+export {hoist, HoisterDependencyKind} from './hoist';