feat(memory): Implement shared memory state across Relay #14510

Job	Run time
Lint	6m 26s
Test (macos-latest)	3m 30s
Test (windows-latest)	6m 30s
Setup build metadata	1s
Lint Rust Default Features	1m 15s
Test All Features (ubuntu-latest)	2m 48s
Integration Tests	14m 33s
Test Python	52s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	14m 16s
Build Docker Image (relay)	26s
Sentry-Relay Integration Tests	10m 53s
Publish Relay to DockerHub	0s
Upload build artifacts to gocd	0s
Publish Relay to GCR	0s
self-hosted-end-to-end	12m 48s
	1h 14m 18s

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