Make pool constructor public

Signed-off-by: Sanjula Ganepola <Sanjula.Ganepola@ibm.com>

src/main/java/io/github/mapepire_ibmi/Pool.java

@@ -50,7 +50,7 @@ public class Pool {
      *
      * @param options The options for configuring the connection pool.
      */
-    Pool(PoolOptions options) {
+    public Pool(PoolOptions options) {
         this.options = options;
     }