Keep track of data usage

[ilteoood]

Is your feature request related to a problem? Please describe.
It would be amazing if, for each test, speedtest-tracker would also be able to collect the amount of data used every single test for both uploads and downloads.
Additionally, these data should be showed on the dashboard using a bar chart.

Describe the solution you'd like
I don't have a strong opinion for this

Additional context
Speedtest-cli should already provide these data, they are reported as data used:
e.g.

Speedtest by Ookla
      Server: Odido - Amsterdam (id: 52365)
         ISP: Odido Netherlands
Idle Latency:     5.20 ms   (jitter: 0.19ms, low: 5.00ms, high: 5.56ms)
    Download:   934.41 Mbps (data used: 827.1 MB)
                 12.44 ms   (jitter: 4.03ms, low: 5.56ms, high: 233.88ms)
      Upload:   930.79 Mbps (data used: 454.9 MB)
                  6.17 ms   (jitter: 0.40ms, low: 4.90ms, high: 7.10ms)
 Packet Loss:     0.0%

[svenvg93]

Just out of interest, What would be the use case that the data usage is intresting to keep track of?

[ilteoood]

My ISP keeps track of the whole amount of data I use. From that, I would like to subtract the amount of data consumed by speedtest-tracker to better understand my real network usage

[alexjustesen]

Looks doable with the data the cli returns and seems to be stored as bytes(download|upload} in the payload:

{
  "upload": {
    "bytes": 437245372,
    "elapsed": 4112,
    "latency": {
      "iqm": 19.557,
      "low": 7.896,
      "high": 82.711,
      "jitter": 7.247
    },
    "bandwidth": 105586574
  },
  "download": {
    "bytes": 119803984,
    "elapsed": 3805,
    "latency": {
      "iqm": 12.365,
      "low": 9.373,
      "high": 27.52,
      "jitter": 3.491
    },
    "bandwidth": 31516397
  }
}