Add external span IDs #883

Job	Run time
cargo clippy (android) (armv7-linux-androideabi)	54s
cargo clippy (android) (aarch64-linux-android)	1m 43s
cargo check (msrv) (android) (armv7-linux-androideabi)	22s
cargo check (msrv) (windows-latest)	1m 26s
cargo clippy (android) (x86_64-linux-android)	1m 34s
cargo check (msrv) (android) (aarch64-linux-android)	42s
cargo clippy (windows-latest)	1m 50s
cargo check (msrv) (macos-latest)	35s
cargo check (msrv) (android) (x86_64-linux-android)	41s
cargo clippy (macos-latest)	1m 23s
cargo check (msrv) (ubuntu-latest)	22s
cargo doc (windows-latest)	1m 27s
cargo clippy (ubuntu-latest)	1m 0s
cargo doc (macos-latest)	23s
formatting	1m 21s
cargo doc (ubuntu-latest)	18s
Prime LFS Cache	4s
typos	6s
cargo test (windows-latest)	1m 42s
cargo test (macos-latest)	44s
cargo test (ubuntu-latest)	28s
	19m 5s

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