Extract layers module from rpc crate

[rupam-04]

Closes #8161

[rupam-04]

@mattsse any updates on this?

[emhane]

lgtm

[rupam-04]

@emhane any idea why some checks are failing?

[emhane]

try locally

rm Cargo.lock
cargo clean
cargo c

then commit the updated lock file, and push. that should do it. @rupam-04

[rupam-04]

try locally

rm Cargo.lock
cargo clean
cargo c

then commit the updated lock file, and push. that should do it. @rupam-04

worked, ty