vmm: imporve observability to vmm-task & vmm-sandboxer #1296

Job	Run time
checks (vmm/sandbox, --all-features)	4m 46s
tests (vmm/sandbox, --all-features)	3m 48s
checks (vmm/task, --all-features)	4m 12s
tests (vmm/task, --all-features)	3m 3s
checks (shim, --all-features)	3m 55s
tests (shim, --all-features)	2m 38s
checks (quark, --all-features)	4m 0s
tests (quark, --all-features)	2m 38s
checks (runc, --all-features)	4m 22s
tests (runc, --all-features)	3m 6s
checks (wasm, --features=wasmedge, 0.13.5)	4m 32s
tests (wasm, --features=wasmedge, 0.13.5)	3m 17s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	4m 45s
tests (wasm, --features=wasmtime)	3m 45s
checks (wasm, --features=wasmtime)	4m 43s
	57m 30s

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