Flatten all patches from a page of CDC events in a single pass
Source:R/updates.R
flatten_page_patches.RdNo recursion. The brreg CDC nesting depth is bounded at 2 levels:
object -> scalar, or object -> array -> scalar. Inlines the unpack
for both levels. Events with no endringer (Ny, Sletting, Fjernet)
emit a single synthetic row with operation = NA, field = NA,
new_value = NA.