Implement Navidrome sharing (#575)

* add share item feature

* take care of (mostly) everything

* bugfixes

* allow clicking on notification to open url

* readd the missing modal after router migration

* remove unnecessary extension

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Co-authored-by: Kendall Garner <17521368+kgarner7@users.noreply.github.com>

src/renderer/features/sharing/index.ts

@@ -0,0 +1,2 @@
+export * from './components/share-item-context-modal';
+export * from './mutations/share-item-mutation';