fix how byteSize is calculated for different input formats

[prezha]

this pr aims to improve handling of different input size formats

details: kubernetes/minikube#20044 (comment)

before

Dec 07 17:23:29 pr-20044-1733346028 nerdctld[109281]: 2024/12/07 17:23:29 strconv.ParseFloat: parsing "0B": invalid syntax
Dec 07 17:23:29 pr-20044-1733346028 systemd[1]: nerdctld.service: Main process exited, code=exited, status=1/FAILURE

after

Dec 07 22:16:36 pr-20044-1733346028 nerdctld[319578]: [GIN-debug] Listening and serving HTTP on listener what's bind with address@/run/nerdctld.sock
Dec 07 22:17:02 pr-20044-1733346028 nerdctld[319578]: [GIN] 2024/12/07 - 22:17:02 | 200 |       2.223µs |                 | HEAD     "/_ping"
Dec 07 22:17:02 pr-20044-1733346028 nerdctld[319578]: [GIN] 2024/12/07 - 22:17:02 | 200 |        1.66µs |                 | HEAD     "/_ping"
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 0B
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 0B
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 97.51MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 97.51MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 97.51MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 98.02MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 98.02MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 98.02MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 31.47MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 31.47MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 31.47MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 66.5MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 66.5MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 66.5MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 151.3MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 151.3MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 151.3MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 741.4kB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 741.4kB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 741.4kB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 95.33MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 95.33MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 95.33MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 70.7MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 70.7MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 70.7MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 91.71MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 91.71MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 91.71MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 97.51MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 97.51MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: 2024/12/07 22:17:03 byteSize: 97.51MB
Dec 07 22:17:03 pr-20044-1733346028 nerdctld[319578]: [GIN] 2024/12/07 - 22:17:03 | 200 |   44.563787ms |                 | GET      "/v1.44/images/json"