build

fix(metadata): Make `AdditionalField` public and permit any JSON type #969

Job	Run time
fmt	28s
build_and_test (stable, --features "")	1m 30s
build_and_test_windows	4m 25s
build_and_test (stable, --all-features)	2m 17s
build_and_test_macos (macos-13)	1m 24s
clippy	52s
build_and_test (stable, --no-default-features)	58s
build_and_test_macos (macos-latest)	1m 1s
build_and_test (1.82, --features "")	1m 20s
semver	1m 41s
build_and_test (1.82, --all-features)	2m 5s
codecov	1m 35s
minimal-versions	44s
build_and_test (1.82, --no-default-features)	1m 16s
build_and_test (beta, --features "")	1m 46s
build_and_test (beta, --all-features)	2m 18s
build_and_test (beta, --no-default-features)	1m 8s
build_and_test (nightly, --features "")	1m 21s
build_and_test (nightly, --all-features)	1m 42s
build_and_test (nightly, --no-default-features)	1m 3s
	30m 54s

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