vmm: imporve observability to vmm-task & vmm-sandboxer #1232

Job	Run time
checks (vmm/sandbox, --all-features)	1m 29s
checks (vmm/task, --all-features)	1m 12s
tests (vmm/sandbox, --all-features)	3m 41s
checks (shim, --all-features)	1m 29s
tests (vmm/task, --all-features)	3m 4s
checks (quark, --all-features)	1m 30s
tests (shim, --all-features)	2m 31s
checks (runc, --all-features)	1m 22s
checks (wasm, --features=wasmedge, 0.13.5)	1m 29s
tests (quark, --all-features)	2m 32s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	1m 29s
tests (runc, --all-features)	2m 59s
checks (wasm, --features=wasmtime)	1m 27s
tests (wasm, --features=wasmedge, 0.13.5)	3m 19s
tests (wasm, --features=wasmtime)	3m 33s
	33m 6s

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