config option to selectively ignore some incoming URLs

This issue is to add an equivalent to [`transaction_ignore_urls`](https://www.elastic.co/docs/reference/apm/agents/nodejs/configuration#transaction-ignore-urls), and also to make it dynamically configurable via central config.

The intent is to implement this using a ComposableRuleBased sampler, so this depends on https://github.com/elastic/elastic-otel-node/issues/1046 being implemented first.