Add instrumentation for AWS Redshift databases

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I followed the basic steps described on the documentation to connect my Flask application. My application connects with a MySql database and with Redshift database. On Kibana web page, when analyzing the data I can see the query statement for the MySql querys, but I can't see the Redshift query statement. On my application, both database connection are made with SQLAlchemy. So is just a question, does it work with Redshift? Maybe I have to check some of my settings, read some advanced topics.

I tried to create a span (`@elasticapm.capture_span()`) on the Redshift method that execute the query to be more specific and visualize what was happening, but still on kibana it show my Redshift span but no query statement.

**Environment **
- OS: Ubuntu 22.04
- Python version: 3.11
- Framework and version: Flask 2.2
- APM Server version:
- Agent version: 6.16.2

Empieza reproduciendo la configuración reportada con Flask, SQLAlchemy y la conexión de Redshift; después, compara sus spans con los spans de MySQL que ya muestran sentencias de consulta en Kibana. El issue estará completo cuando las sentencias de consulta de Redshift sean visibles en Kibana y el comportamiento esté cubierto por una prueba de regresión.

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