use init struct pattern #287

Job	Run time
changed-files	4s
changed-files-miri	16s
build-docs	1m 48s
test-on-windows-latest	5m 48s
test-on-windows-latest-aarch64	2m 27s
test-on-macos-latest	1m 32s
test-on-ubuntu-latest	2m 1s
test-on-ubuntu-latest-arm32	1m 36s
test-on-ubuntu-latest-aarch64	1m 23s
test-on-ubuntu-latest-use_meter left_handed	1m 59s
test-on-ubuntu-latest-async	1m 58s
test-on-ubuntu-latest-lightweight async-trait	2m 8s
test-on-ubuntu-latest-dynamic_freq	2m 5s
test-with-miri	0s
all-tests-passed	1s
auto-merge	0s
	25m 6s

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