build

fix(metadata): Make `AdditionalField` public and permit any JSON type #967

Job	Run time
build_and_test_windows	6m 6s
clippy	1m 39s
build_and_test_macos (macos-13)	3m 47s
build_and_test (stable, --features "")	2m 33s
build_and_test_macos (macos-latest)	2m 37s
build_and_test (stable, --all-features)	3m 3s
codecov	3m 44s
fmt	40s
build_and_test (stable, --no-default-features)	2m 17s
build_and_test (1.82, --features "")	2m 42s
minimal-versions	2m 57s
semver	4m 7s
build_and_test (1.82, --all-features)	3m 16s
build_and_test (1.82, --no-default-features)	3m 24s
build_and_test (beta, --features "")	2m 42s
build_and_test (beta, --all-features)	3m 8s
build_and_test (beta, --no-default-features)	2m 11s
build_and_test (nightly, --features "")	2m 35s
build_and_test (nightly, --all-features)	2m 49s
build_and_test (nightly, --no-default-features)	2m 8s
	58m 25s

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