Remove spin-engine crate

Signed-off-by: Lann Martin <lann.martin@fermyon.com>

Author: lann

Cargo.lock

@@ -32,7 +32,6 @@ serde_json = "1.0.82"
 sha2 = "0.10.2"
 spin-build = { path = "crates/build" }
 spin-config = { path = "crates/config" }
-spin-engine = { path = "crates/engine" }
 spin-http = { path = "crates/http" }
 spin-loader = { path = "crates/loader" }
 spin-manifest = { path = "crates/manifest" }
@@ -75,7 +74,6 @@ members = [
     "crates/build",
     "crates/config",
     "crates/core",
-    "crates/engine",
     "crates/http",
     "crates/loader",
     "crates/manifest",