Add method for creating MacAddr for multicast IPs #313

Job	Run time
test-cross (aarch64-unknown-linux-gnu)	1m 20s
test-matrix (ubuntu-22.04, stable)	39s
test-cross (aarch64-unknown-linux-musl)	1m 23s
test-matrix (ubuntu-22.04, beta)	49s
test-cross (armv7-unknown-linux-musleabi)	1m 21s
test-matrix (ubuntu-22.04, nightly)	54s
test-matrix (ubuntu-22.04, 1.84.0)	42s
test-cross (x86_64-unknown-linux-musl)	1m 43s
test-matrix (ubuntu-24.04, stable)	35s
test-matrix (ubuntu-24.04, beta)	50s
test-matrix (ubuntu-24.04, nightly)	48s
test-matrix (ubuntu-24.04, 1.84.0)	43s
test-matrix (macos-14, stable)	46s
test-matrix (macos-14, beta)	51s
test-matrix (macos-14, nightly)	54s
test-matrix (macos-14, 1.84.0)	50s
test-matrix (macos-15, stable)	48s
test-matrix (macos-15, beta)	53s
test-matrix (macos-15, nightly)	52s
test-matrix (macos-15, 1.84.0)	53s
	18m 34s

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