feat(envelope-item): Support metric type #6227

Job	Run time
system-test (sentry-samples-spring-boot-webflux-jakarta, false, true)	4m 51s
system-test (sentry-samples-spring-boot, false, true)	4m 50s
system-test (sentry-samples-spring-boot-webflux, false, true)	4m 47s
system-test (sentry-samples-spring-boot-opentelemetry, true, false)	7m 13s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry, true, true)	7m 36s
system-test (sentry-samples-spring-boot-jakarta, false, true)	6m 8s
system-test (sentry-samples-console, false, true)	2m 21s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry-noagent, false, true)	6m 41s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry, true, false)	7m 46s
system-test (sentry-samples-spring-boot-opentelemetry, true, true)	6m 43s
system-test (sentry-samples-spring-boot-4-opentelemetry, true, true)	8m 2s
system-test (sentry-samples-spring-boot-opentelemetry-noagent, false, true)	7m 13s
system-test (sentry-samples-spring-boot-4, false, true)	4m 29s
system-test (sentry-samples-spring-boot-4-opentelemetry, true, false)	6m 59s
system-test (sentry-samples-spring-boot-4-webflux, false, true)	5m 3s
system-test (sentry-samples-jul, false, true)	2m 15s
system-test (sentry-samples-spring, false, true)	3m 59s
system-test (sentry-samples-spring-7, false, true)	4m 32s
system-test (sentry-samples-logback, false, true)	2m 24s
system-test (sentry-samples-spring-jakarta, false, true)	4m 52s
system-test (sentry-samples-log4j2, false, true)	2m 21s
	1h 51m 5s

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