runtime-rs: Refactor feature propagation

After runtime-rs workspace merged into root workspace, features passed
when building runtime-rs needs to be refactored to be correctly
propagated. Taking dragonball for example, runtime-rs requires runtimes
to depend on virt_conttainers feature, and virt_containers needs to
handle hypervisor features specifically.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

src/runtime-rs/crates/runtimes/Cargo.toml

@@ -57,5 +57,5 @@ linux = ["linux_container"]
 virt = ["virt_container"]
 wasm = ["wasm_container"]
 
-dragonball = []
-cloud-hypervisor = []
+dragonball = ["virt_container/dragonball"]
+cloud-hypervisor = ["virt_container/cloud-hypervisor"]

src/runtime-rs/crates/runtimes/virt_container/Cargo.toml

@@ -44,7 +44,7 @@ resource = { workspace = true }
 default = ["cloud-hypervisor"]
 
 # Enable the Cloud Hypervisor driver
-cloud-hypervisor = []
+cloud-hypervisor = ["hypervisor/cloud-hypervisor"]
 
 # Enable the build-in VMM Dragtonball
-dragonball = []
+dragonball = ["hypervisor/dragonball"]