feat!: Add Body type #3658

Job	Run time
cargo-deny check	23s
clippy	1m 21s
codegen	18s
check (ubuntu-latest)	2m 58s
Check MSRV	45s
check (macOS-latest)	4m 29s
Interop Tests (ubuntu-latest)	38s
check (windows-latest)	7m 12s
rustfmt	9s
Interop Tests (macOS-latest)	1m 24s
semver	1m 13s
Interop Tests (windows-latest)	3m 41s
test (ubuntu-latest)	3m 32s
Check unused dependencies	4m 25s
test (macOS-latest)	3m 24s
check-external-types	33s
test (windows-latest)	6m 6s
	42m 31s

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