vmm: imporve observability to vmm-task & vmm-sandboxer #1265

Job	Run time
tests (vmm/sandbox, --all-features)	3m 44s
checks (vmm/sandbox, --all-features)	5m 16s
tests (vmm/task, --all-features)	3m 3s
checks (vmm/task, --all-features)	4m 12s
tests (shim, --all-features)	2m 32s
checks (shim, --all-features)	4m 6s
tests (quark, --all-features)	2m 35s
checks (quark, --all-features)	3m 55s
tests (runc, --all-features)	2m 59s
checks (runc, --all-features)	4m 33s
tests (wasm, --features=wasmedge, 0.13.5)	3m 17s
checks (wasm, --features=wasmedge, 0.13.5)	4m 46s
tests (wasm, --features=wasmtime)	3m 48s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	4m 38s
checks (wasm, --features=wasmtime)	4m 40s
	58m 4s

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