unjs/c12

#1 — env configuration enhancements cluster

#2 — name config search support cluster

#3 — cannot extend or add to directory/object cluster

#4 — config splitting and overriding cluster

#5 — execute scripts on install cluster

#6 — config file format support cluster

#7 — config loader issues cluster

#8 — watch remote sources support cluster

#9 — support config validation without extension cluster