Add function to compute Solicited-Node multicast address for IPv6 add… #311

Job	Run time
test-cross (aarch64-unknown-linux-gnu)	1m 23s
test-matrix (ubuntu-22.04, stable)	44s
test-cross (aarch64-unknown-linux-musl)	1m 28s
test-matrix (ubuntu-22.04, beta)	51s
test-cross (armv7-unknown-linux-musleabi)	1m 28s
test-cross (x86_64-unknown-linux-musl)	1m 32s
test-matrix (ubuntu-22.04, nightly)	47s
test-matrix (ubuntu-22.04, 1.84.0)	50s
test-matrix (ubuntu-24.04, stable)	42s
test-matrix (ubuntu-24.04, beta)	41s
test-matrix (ubuntu-24.04, nightly)	44s
test-matrix (ubuntu-24.04, 1.84.0)	43s
test-matrix (macos-14, stable)	56s
test-matrix (macos-14, beta)	57s
test-matrix (macos-14, nightly)	57s
test-matrix (macos-14, 1.84.0)	44s
test-matrix (macos-15, stable)	1m 0s
test-matrix (macos-15, beta)	44s
test-matrix (macos-15, nightly)	54s
test-matrix (macos-15, 1.84.0)	47s
	18m 52s

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