feat: Add `misc.is_b2c` field (#1553) #19

Job	Run time
install-cross (linux-musl)	3s
install-cross (apple-darwin)	6s
macos (x86_64-apple-darwin)	11m 14s
linux (aarch64-unknown-linux-gnu)	6m 59s
windows	0s
linux (x86_64-unknown-linux-gnu)	6m 27s
linux (x86_64-unknown-linux-musl)	6m 55s
	31m 44s

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