refactor(tinybench): share structure across walltime and instrumented #679

Job	Run time
check	1m 17s
List examples	4s
with-typescript-simple-cjs on Node 20.5.1	3m 29s
with-typescript-esm on Node 18	3m 30s
with-typescript-cjs on Node 20.5.1	2m 3s
with-typescript-cjs on Node 18	4m 16s
with-typescript-esm on Node 20.5.1	3m 51s
with-javascript-esm on Node 18	3m 18s
with-typescript-simple-cjs on Node 18	2m 14s
with-typescript-simple-esm on Node 18	3m 57s
with-javascript-esm on Node 20.5.1	3m 57s
with-typescript-simple-esm on Node 20.5.1	3m 43s
	35m 39s

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