sdk/log: Add design doc #11059

Job	Run time
compatibility-test (~1.22.0, ubuntu-latest, 386)	38s
compatibility-test (~1.22.0, ubuntu-latest, 386)	38s
compatibility-test (~1.22.0, ubuntu-latest, amd64)	1m 3s
compatibility-test (~1.22.0, ubuntu-latest, amd64)	1m 3s
compatibility-test (~1.22.0, macos-latest, amd64)	2m 7s
compatibility-test (~1.22.0, macos-latest, amd64)	2m 7s
compatibility-test (~1.22.0, windows-latest, 386)	3m 55s
compatibility-test (~1.22.0, windows-latest, 386)	3m 55s
compatibility-test (~1.22.0, windows-latest, amd64)	2m 29s
compatibility-test (~1.22.0, windows-latest, amd64)	2m 29s
compatibility-test (~1.21.3, ubuntu-latest, 386)	46s
compatibility-test (~1.21.3, ubuntu-latest, 386)	46s
compatibility-test (~1.21.3, ubuntu-latest, amd64)	1m 3s
compatibility-test (~1.21.3, ubuntu-latest, amd64)	1m 3s
compatibility-test (~1.21.3, macos-latest, amd64)	1m 51s
compatibility-test (~1.21.3, macos-latest, amd64)	1m 51s
compatibility-test (~1.21.3, windows-latest, 386)	2m 46s
compatibility-test (~1.21.3, windows-latest, 386)	2m 46s
compatibility-test (~1.21.3, windows-latest, amd64)	3m 22s
compatibility-test (~1.21.3, windows-latest, amd64)	3m 22s
lint	2m 28s
lint	2m 28s
test-bench	40s
test-bench	40s
test-coverage	1m 12s
test-coverage	1m 15s
test-race	1m 46s
test-race	1m 46s
test-compatibility	1s
test-compatibility	1s
	52m 17s

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