add `nodejs.eventloop.time` metric (#1259) #1

Job	Run time
markdown-link-check	4m 59s
markdownlint	19s
areas-dropdown-check	4s
misspell	12s
markdown-toc-check	37s
schemas-check	16s
policies-check	55s
semantic-conventions	10s
semantic-conventions-compatibility	14s
semantic-conventions-registry	17s
yamllint	12s
	8m 15s

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