Add initial c2a configuration. am: f2a65af3c6

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/annotate-snippets/+/2638615

Change-Id: I03fc0ac933ea1fff82260518d472609619da6518
Signed-off-by: Automerger Merge Worker <[email protected]>