Update OpenAI example to show tools being called

[b-per]

Make the example more extensive by allowing people to see what tools are called and what parameters are sent to the MCP tools

Example:

User > what was the revenue in 2017
# Calling the tool list_metrics with params {}
# Calling the tool get_dimensions with params {"metrics":["revenue"]}
# Calling the tool query_metrics with params {"metrics":["revenue"],"where":"{{ TimeDimension('metric_time', 'YEAR') }} >= '2017-01-01' AND {{ TimeDimension('metric_time', 'YEAR') }} < '2018-01-01'"}
Revenue in 2017 was 610,688.

[DevonFulcher]

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