chore: add opentelemetry-otlp integration example #73

Job	Run time
cargo check	1m 6s
cargo check (feature combinations)	41s
cargo fmt	10s
cargo check (+MSRV -Zminimal-versions) (1.60.0)	2m 34s
cargo check (+MSRV -Zminimal-versions) (stable)	38s
cargo test (stable on ubuntu-latest)	2m 28s
cargo test (beta on ubuntu-latest)	2m 6s
cargo test (nightly on ubuntu-latest)	1m 53s
cargo test (stable on windows-latest)	4m 13s
cargo test (stable on macos-latest)	2m 45s
build tests (wasm)	2m 20s
warnings	1m 6s
all systems go!	2s
	22m 2s

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