chore: split sql to driver (#2279)

* Add new database interface for SQL operations

* Move SQL code of Activity into Database

* Rename `Database` into `Driver`

* Move SQL code of SystemSetting into Driver

* Fix store.New in text code

* Change database into driver in the variables

* Change sqlite3.New into sqlite3.NewDriver

store/driver.go

@@ -0,0 +1,10 @@
+package store
+
+import "context"
+
+type Driver interface {
+	CreateActivity(ctx context.Context, create *Activity) (*Activity, error)
+
+	UpsertSystemSetting(ctx context.Context, upsert *SystemSetting) (*SystemSetting, error)
+	ListSystemSettings(ctx context.Context, find *FindSystemSetting) ([]*SystemSetting, error)
+}