Add vertx postgresql client instrumentation

[onkar-dream11]

What Does This Do

This PR adds support for automatic tracing of PostgreSQL queries when using the Vert.x PostgreSQL Client in a Vert.x 4 application, enabling Datadog APM to capture query execution times and database interactions.

Motivation

Datadog APM currently doesn't automatically trace PostgreSQL queries executed via the Vert.x PostgreSQL Client, leading to a lack of visibility into database operations. This fix addresses that gap.

Additional Notes

The PR ensures that PostgreSQL queries are automatically instrumented and visible in Datadog APM.

Contributor Checklist

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  Use solves instead, and assign the PR milestone to the issue
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Jira ticket: [PROJ-IDENT]

[onkar-dream11]

@PerfectSlayer@gary-huang can you please help me identify why the checks are failing??

[PerfectSlayer]

Hello @onkar-dream11 👋 First, thanks for you contribution.
The tests will be failing as they are missing credentials as you are not part of the Datadog GitHub organisation.
I will reach the integration team to follow up with your submission.

[vandonr]

looks ok, but most of the code has been duplicated compared to the existing mysql integration. I think it'd be better to have only the Pg* classes in this package, do the same for mysql, and put the common code in a vertex-sql-common to avoid that.
I can let you do it, or I can take your commits in a branch I own and do it if you prefer.

[onkar-dream11]

@vandonr I have resolved the given comments, and regarding common code I thought of it having in vertx-sql-common to avoid duplication, like with MySQL. However, I kept it separate for now because I thought test cases might fail when writing between modules. Could you take my commit and make the changes?

[vandonr]

TIL I can push to a branch on a fork

[vandonr]

OK I think I may need to push on my own branch anyway for the CI to run properly

[vandonr]

closing in favor of #8471