Attach promise count to Sentry transactions

[AbhiPrasad]

Problem Statement

Related to #9319, but attach number of created and settled promises as a measurement on a transaction.

Solution Brainstorm

https://nodejs.org/api/v8.html#promise-hooks

https://twitter.com/bengl/status/1716124565259104425

[Dhoni77]

Hi @AbhiPrasad I would like to work on this

[AbhiPrasad]

Hey @Dhoni77 happy to get your help! Before you open a PR, could you create a POC with your approach?

[AbhiPrasad]

https://github.com/bengl/count-promises/blob/main/count-promises.js