Add `default` constructor to `ImageAsset` #2448

Job	Run time
Documentation	12m 28s
ubuntu-22.04 / gcc / Debug	19m 20s
windows-2019 / Debug	22m 54s
ubuntu-22.04 / gcc / RelWithDebInfo	24m 59s
Quick Checks	11s
windows-2019 / RelWithDebInfo	25m 22s
ubuntu-20.04 / clang / Debug	18m 47s
windows-2022 / Debug	23m 49s
ubuntu-20.04 / clang / RelWithDebInfo	22m 54s
windows-2022 / RelWithDebInfo	24m 56s
macos-12 / clang / Debug	21m 36s
macos-12 / clang / RelWithDebInfo	22m 56s
	4h 0m 12s

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