Improvements on dataloader integration

[onurtemizkan]

Problem Statement

Following up: #13664

#13664 introduced basic support for dataloader integration on Sentry Node SDK.

In its current state, the feature set is limited, as there's no hook we can get request / lookup information from the underlying instrumentation @opentelemetry/instrumentation-dataloader.

More info on this: #13664 (comment)

Solution Brainstorm

We can open PRs on https://github.com/open-telemetry/opentelemetry-js-contrib/

• Adding a requestHook or lookupHook to the OTEL instrumentation
• Add instrumentations for prime, clear and clearAll operations in dataloader integration. #13729

[AbhiPrasad]

I think requestHook would be super useful, but luckily we can rely on beforeSendSpan so it's not high priority.

We should see if we can get the extra operations instrumented, and then also see if we can get additional attributes attached to these spans (that then we can use to enable these spans for our cache module).