Context

#8917 introduced built-in build event args classes for most commonly custom-subclassed build event args types. The CriticalBuildMessageEventArgs was ommited, while there is possible need for that.

Goal

In a same idea as #8917 add support for using CriticalBuildMessageEventArgs with a custom data. The naming is up for implementer decision (need to weight in balance between descriptiveness and easy 'human-discoverability').