Feat: import and export csv (#2617)

* feat: import csv

* feat: export

* chore: implement import export csv in the backend

* chore: patch

frontend/rust-lib/flowy-database2/tests/database/share_test/export_test.rs

@@ -0,0 +1,36 @@
+use crate::database::database_editor::DatabaseEditorTest;
+use flowy_database2::services::share::csv::ExportStyle;
+
+#[tokio::test]
+async fn export_and_then_import_test() {
+  let test = DatabaseEditorTest::new_grid().await;
+  let database = test.editor.clone();
+  let csv_1 = database.export_csv(ExportStyle::SIMPLE).await.unwrap();
+
+  let imported_database_id = test.import(csv_1.clone()).await;
+  let csv_2 = test
+    .get_database(&imported_database_id)
+    .await
+    .unwrap()
+    .export_csv(ExportStyle::SIMPLE)
+    .await
+    .unwrap();
+
+  let mut reader = csv::Reader::from_reader(csv_1.as_bytes());
+  let export_csv_records_1 = reader.records();
+
+  let mut reader = csv::Reader::from_reader(csv_2.as_bytes());
+  let export_csv_records_2 = reader.records();
+
+  let mut a = export_csv_records_1
+    .map(|v| v.unwrap())
+    .flat_map(|v| v.iter().map(|v| v.to_string()).collect::<Vec<_>>())
+    .collect::<Vec<String>>();
+  let mut b = export_csv_records_2
+    .map(|v| v.unwrap())
+    .flat_map(|v| v.iter().map(|v| v.to_string()).collect::<Vec<_>>())
+    .collect::<Vec<String>>();
+  a.sort();
+  b.sort();
+  assert_eq!(a, b);
+}

frontend/rust-lib/flowy-database2/tests/database/share_test/mod.rs

@@ -0,0 +1 @@
+mod export_test;