Add new benches for logs (#1450) #21

Job	Run time
coverage	7m 57s
cargo-deny	25s
docs	5m 38s
external-types (opentelemetry)	1m 7s
external-types (opentelemetry-sdk)	1m 17s
lint	20m 1s
msrv	3m 13s
non-default-examples (opentelemetry-otlp/examples/external-otlp-grpcio-async-std)	5m 8s
test (stable)	17m 36s
test (beta)	17m 25s
non-default-examples (opentelemetry-otlp/examples/basic-otlp)	44s
	1h 20m 31s

Provide feedback