feat(spans): extract user.geo.geoscheme metrics #14892

Job	Run time
Lint Rust Default Features	1m 40s
Lint	3m 35s
Test (macos-latest)	2m 24s
Test (windows-latest)	7m 20s
Test All Features (ubuntu-latest)	3m 35s
Setup build metadata	1s
Integration Tests	13m 1s
Test Python	58s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	7m 52s
Build Docker Image (relay)	44s
Sentry-Relay Integration Tests	10m 44s
Publish Relay to DockerHub	0s
self-hosted-end-to-end	13m 3s
Upload build artifacts to gocd	0s
Publish Relay to GCR	0s
	1h 4m 57s

Provide feedback