Prepare for v0.27.0 - update Metrics API and Log(bridge) API to RC, Metrics SDK & OTLP Exporter to Beta. (open-telemetry#2290)

Author: lalitb

Cargo.toml

@@ -17,4 +17,4 @@ testcontainers = "0.15.0"
 [target.'cfg(unix)'.dependencies]
 opentelemetry-appender-log = { path = "../../../opentelemetry-appender-log", default-features = false}
 opentelemetry-otlp = { path = "../../../opentelemetry-otlp", features = ["tonic", "metrics", "logs"] }
-opentelemetry-semantic-conventions = { path = "../../../opentelemetry-semantic-conventions" }
+opentelemetry-semantic-conventions = { path = "../../../opentelemetry-semantic-conventions" }