feat: add forum Nim client improvements and SQLite adaptor

adaptors/nim/test_baradb_adapter.nim

@@ -0,0 +1,21 @@
+import baradb_sqlite
+
+var db = open("127.0.0.1:9472", "", "", "default")
+
+db.exec(sql"CREATE TABLE test_adapter (id INT PRIMARY KEY, name STRING)")
+db.exec(sql"INSERT INTO test_adapter (id, name) VALUES (1, 'hello')")
+db.exec(sql"INSERT INTO test_adapter (id, name) VALUES (2, 'world')")
+
+let rows = db.getAllRows(sql"SELECT * FROM test_adapter")
+echo "All rows: ", rows
+
+let row = db.getRow(sql"SELECT * FROM test_adapter WHERE id = 1")
+echo "Row 1: ", row
+
+let val = db.getValue(sql"SELECT name FROM test_adapter WHERE id = 2")
+echo "Value: ", val
+
+let cnt = db.getValue(sql"SELECT count(*) FROM test_adapter")
+echo "Count: ", cnt
+
+db.close()