feat: implement collections syncing for selfhosted (#42)

packages/hoppscotch-selfhost-web/src/api/queries/ExportUserCollectionsToJSON.graphql

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+query ExportUserCollectionsToJSON(
+  $collectionID: ID
+  $collectionType: ReqType!
+) {
+  exportUserCollectionsToJSON(
+    collectionID: $collectionID
+    collectionType: $collectionType
+  ) {
+    collectionType
+    exportedCollection
+  }
+}

packages/hoppscotch-selfhost-web/src/api/queries/GetRootGQLUserCollections.graphql

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+query GetGQLRootUserCollections {
+  # the frontend doesnt paginate right now, so giving take a big enough value to get all collections at once
+  rootGQLUserCollections(take: 99999) {
+    id
+    title
+    type
+    childrenGQL {
+      id
+      title
+      type
+    }
+  }
+}

packages/hoppscotch-selfhost-web/src/api/queries/GetUserRootCollections.graphql

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+query GetUserRootCollections {
+  # the frontend doesnt paginate right now, so giving take a big enough value to get all collections at once
+  rootRESTUserCollections(take: 99999) {
+    id
+    title
+    type
+    childrenREST {
+      id
+      title
+      type
+    }
+  }
+}