feat(wfe-containerd-protos): generate full containerd gRPC API (tonic 0.14)

New crate generating Rust gRPC stubs from the official containerd
proto files (vendored as git submodule). Full client-facing API surface
using tonic 0.14 / prost 0.14. No transitive dependency conflicts.

Services: containers, content, diff, events, images, introspection,
leases, mounts, namespaces, sandbox, snapshots, streaming, tasks,
transfer, version.

wfe-containerd-protos/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "wfe-containerd-protos"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+description = "Generated gRPC stubs for the full containerd API"
+
+[dependencies]
+tonic = "0.14"
+tonic-prost = "0.14"
+prost = "0.14"
+prost-types = "0.14"
+
+[build-dependencies]
+tonic-build = "0.14"
+tonic-prost-build = "0.14"
+prost-build = "0.14"