vmm: imporve observability to vmm-task & vmm-sandboxer #1314

Job	Run time
checks (vmm/sandbox, --all-features)	5m 6s
checks (vmm/task, --all-features)	4m 8s
tests (vmm/sandbox, --all-features)	3m 52s
tests (vmm/task, --all-features)	3m 2s
checks (shim, --all-features)	4m 4s
tests (shim, --all-features)	2m 38s
checks (quark, --all-features)	3m 51s
tests (quark, --all-features)	2m 34s
checks (runc, --all-features)	4m 23s
tests (runc, --all-features)	3m 9s
checks (wasm, --features=wasmedge, 0.13.5)	4m 37s
tests (wasm, --features=wasmedge, 0.13.5)	3m 29s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	4m 47s
tests (wasm, --features=wasmtime)	3m 44s
checks (wasm, --features=wasmtime)	4m 38s
	58m 2s

Provide feedback