feat: Add `inform_latest_results()` #525

Job	Run time
website / pkgdown	4m 49s
R-CMD-check / setup	1m 7s
routine / routine	5m 11s
R-CMD-check / macOS-latest (4.4.2)	3m 25s
R-CMD-check / windows-latest (4.4.2)	4m 24s
R-CMD-check / ubuntu-latest (devel)	4m 11s
R-CMD-check / ubuntu-latest (4.4.2)	3m 30s
R-CMD-check / ubuntu-latest (4.3.3)	3m 29s
R-CMD-check / ubuntu-latest (4.2.3)	4m 0s
R-CMD-check / ubuntu-latest (4.1.3)	4m 35s
R-CMD-check / ubuntu-latest (4.0.5)	3m 45s
	42m 26s

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