Add initial c2a configuration. am: f2a65af3c6 am: 14d5ed960a am: e13d4da608

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

Change-Id: Ib5ad8a9e7d105ad352e7911459c1ff96a7357c39
Signed-off-by: Automerger Merge Worker <[email protected]>