log: Add design doc #10549

Job	Run time
lint	2m 23s
compatibility-test (~1.22.0, ubuntu-latest, 386)	24s
test-bench	59s
compatibility-test (~1.22.0, ubuntu-latest, amd64)	1m 8s
compatibility-test (~1.22.0, macos-latest, amd64)	1m 12s
test-race	1m 57s
test-coverage	1m 21s
compatibility-test (~1.22.0, windows-latest, 386)	1m 56s
compatibility-test (~1.22.0, windows-latest, amd64)	2m 51s
compatibility-test (~1.21.3, ubuntu-latest, 386)	36s
compatibility-test (~1.21.3, ubuntu-latest, amd64)	1m 4s
compatibility-test (~1.21.3, macos-latest, amd64)	1m 39s
compatibility-test (~1.21.3, windows-latest, 386)	3m 36s
compatibility-test (~1.21.3, windows-latest, amd64)	4m 24s
compatibility-test (~1.20.10, ubuntu-latest, 386)	37s
compatibility-test (~1.20.10, ubuntu-latest, amd64)	1m 9s
compatibility-test (~1.20.10, macos-latest, amd64)	1m 34s
compatibility-test (~1.20.10, windows-latest, 386)	3m 49s
compatibility-test (~1.20.10, windows-latest, amd64)	3m 48s
test-compatibility	1s
	36m 28s

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