Make SharedAssetDepot implementation not inline. #2998

Job	Run time
Linting	28m 29s
Documentation	12m 25s
Quick Checks	10s
ubuntu-22.04 / gcc / Debug	22m 12s
windows-2022 / Debug	26m 40s
ubuntu-22.04 / gcc / RelWithDebInfo	27m 36s
windows-2022 / RelWithDebInfo	31m 47s
ubuntu-20.04 / clang / Debug	21m 11s
ubuntu-20.04 / clang / RelWithDebInfo	26m 24s
macos-13 / clang / Debug	25m 25s
macos-13 / clang / RelWithDebInfo	33m 5s
	4h 15m 24s

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