storage: begin implementing sqlite3 storage

storage/sqlite3.go

@@ -0,0 +1,17 @@
+package storage
+
+import "database/sql"
+
+func createBlockTable(conn *sql.DB) error {
+	tableCreation := `
+		CREATE TABLE IF NOT EXISTS blocks (
+			height INTEGER,
+			hash TEXT,
+			has_sapling_tx BOOL,
+			compact_encoding BLOB,
+			PRIMARY KEY (height, hash)
+		);
+	`
+	_, err := conn.Exec(tableCreation)
+	return err
+}