Support the `StatementInspector` API

[DavideD]

Based on this question on StackOverflow, we don't support the StatementInspector API.

It seems something useful to have, but I haven't looked into it yet.

We should:

1. Check that it actually doesn't work
2. Figure out how to make it work, if there's an alternative, or if it makes sense to have it

[DavideD]

I think it's fair to say that StatementInspector doesn't work with Hibernate Reactive currently.

As a workaround, this should work:

You could create a wrapper around ReactiveConnection and intercepts all the calls related to the execution of the query.

For example, you can have:

public class ConnectionInterceptor implements ReactiveConnection {
   private final ReactiveConnection delegate;

   public ConnectionInterceptor(ReactiveConnection delegate) {
      this.delegate = delegate;
   }

   public CompletionStage<Void> execute(String sql) {
       String newSql = convert(sql);
       return delegate.execute(newSql);
   }

   // ... You need to implement all the other methods running a query
}

package my.example;

public class MyPool extends DefaultSqlClientPool {

   public CompletionStage<ReactiveConnection> getConnection() {
     return super.getConnection().thenApply( ConnectionInterceptor::new );
   }

}

You can register the new pool class using the property hibernate.vertx.pool.class:

hibernate.vertx.pool.class = my.example.MyPool

Taken from this SO answer.