Add an artd method to create an SDC file.

See https://r.android.com/3539979 as well as
go/art-cloud-compilation-platform-design "Overview",
"Detailed design -> SDC file", and
"Detailed design -> Incremental considerations" for details.

Bug: 377474232
Test: atest art_standalone_artd_tests
Change-Id: I870016723d77e75540894ac0c29bf1b32bf835e7