feat: add `plot/vega/base/assert/is-compare` #20252

Job	Run time
Rebase this PR on top of develop branch	0s
Auto-fix lint errors	0s
Manage labels	0s
Remove in-progress label	-1s
Merge changes from develop branch into this PR	-1s
Update copyright header years	-1s
Check for required files	-1s
	-4s

Provide feedback