Export event-name in OTLP Exporter optionally, if the feature-flag is enabled #5958

Job	Run time
cargo-deny	22s
external-types (opentelemetry)	59s
external-types (opentelemetry-sdk)	1m 5s
lint	1m 16s
external-types (opentelemetry-otlp)	1m 14s
external-types (opentelemetry-zipkin)	1m 8s
msrv (windows-latest, 1.65.0)	48s
msrv (windows-latest, 1.70.0)	53s
non-default-examples (windows-latest, opentelemetry-otlp/examples/basic-otlp)	2m 25s
non-default-examples (ubuntu-latest, opentelemetry-otlp/examples/basic-otlp)	41s
msrv (ubuntu-latest, 1.65.0)	1m 1s
test (ubuntu-latest, stable)	1m 10s
msrv (ubuntu-latest, 1.70.0)	47s
test (ubuntu-latest, beta)	1m 26s
test (stable, windows-latest)	1m 20s
test (stable, macos-latest)	1m 8s
test (stable, actuated-arm64-4cpu-16gb)	1m 8s
coverage	1m 21s
docs	1m 1s
	21m 13s

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