Additional card in main window showing the network hashrate

[lemois-1337]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
It is very beneficial if miners will see the network hashrate in comparison to their device hashrate when running miner and node together on the same system. The hashrate has to be in human readable format, so automatic format for KH/sec, MH/sec, GH/sec, TH/sec and PH/sec has to be calculated.

Additional context
See the screenshot below, where to add it:

[RoboticWF]

Any suggestions where to pull the miners hashrate from?

[lemois-1337]

The miner hashrate is already shown, when a miner is started. The node dashboard should also show the global network hashrate. It can be requested from GetBlockDagInfo gRPC call and some additional calculation, CLI example:

~# karlsenctl GetBlockDagInfo 
{
    "getBlockDagInfoResponse": {
        "networkName": "karlsen-mainnet",
        "blockCount": "190534",
        "headerCount": "7726849",
        "tipHashes": [
            "1e2ab01fc305cf3e782674f3bb2bf8c5f0fd2d6aeebe51933ce385292a7f91d2"
        ],
        "difficulty": 102993445633923.78,
        "pastMedianTime": "1706136665163",
        "virtualParentHashes": [
            "1e2ab01fc305cf3e782674f3bb2bf8c5f0fd2d6aeebe51933ce385292a7f91d2"
        ],
        "pruningPointHash": "af59a6315ffdbdbc6cf0f5bf343304e56def9c6005d4726b78e875872aa4a798",
        "virtualDaaScore": "6946012",
        "error": null
    }
}

Use difficulty multiply it with 2 and divide it by 1.000.000.000.000 to get the TH/sec. One-liner using jq:

~# echo "$(karlsenctl GetBlockDagInfo | jq '.getBlockDagInfoResponse.difficulty')*2/1000000000000" | bc -l
206.81829374176844000000