feat: add @standardnotes/encryption package (#1199)

* feat: add @standardnotes/encryption package

* fix: mobile dependency on encryption package

* fix: order of build & lint in pr workflows

* fix: web dependency on encryption package

* fix: remove encryption package composite configuration

* fix: import order

packages/encryption/src/Domain/Service/Functions.ts

@@ -0,0 +1,24 @@
+import { ItemsKeyInterface } from '@standardnotes/models'
+
+export function findDefaultItemsKey(itemsKeys: ItemsKeyInterface[]): ItemsKeyInterface | undefined {
+  if (itemsKeys.length === 1) {
+    return itemsKeys[0]
+  }
+
+  const defaultKeys = itemsKeys.filter((key) => {
+    return key.isDefault
+  })
+
+  if (defaultKeys.length > 1) {
+    /**
+     * Prioritize one that is synced, as neverSynced keys will likely be deleted after
+     * DownloadFirst sync.
+     */
+    const syncedKeys = defaultKeys.filter((key) => !key.neverSynced)
+    if (syncedKeys.length > 0) {
+      return syncedKeys[0]
+    }
+  }
+
+  return defaultKeys[0]
+}