Support `-show-timings` for `odin doc` #13267

Job	Run time
NetBSD Build, Check, and Test	5m 30s
Windows Build, Check, and Test	2m 43s
Linux riscv64 (emulated) Build, Check and Test	2m 46s
FreeBSD Build, Check, and Test	4m 18s
Ubuntu Build, Check, and Test	2m 58s
MacOS Intel Build, Check, and Test	3m 20s
MacOS ARM Build, Check, and Test	1m 56s
	23m 31s

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