vmm: imporve observability to vmm-task & vmm-sandboxer #1264

Job	Run time
checks (vmm/sandbox, --all-features)	5m 6s
tests (vmm/sandbox, --all-features)	3m 49s
checks (vmm/task, --all-features)	4m 31s
tests (vmm/task, --all-features)	3m 0s
checks (shim, --all-features)	3m 56s
tests (shim, --all-features)	2m 32s
checks (quark, --all-features)	4m 0s
tests (quark, --all-features)	2m 28s
checks (runc, --all-features)	4m 21s
tests (runc, --all-features)	2m 58s
checks (wasm, --features=wasmedge, 0.13.5)	4m 43s
tests (wasm, --features=wasmedge, 0.13.5)	3m 27s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	4m 48s
tests (wasm, --features=wasmtime)	3m 40s
checks (wasm, --features=wasmtime)	4m 37s
	57m 56s

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