feat: individual gpu settings

[Misieq01]

Continuation of #1054

Important note

It Requires versions 0.1.19 of gpuminer. From what i saw release for this version didn't passed so to work with this PR or test it its required to build gpuminer from main locally and replace binaries until version 0.1.19 is released

[ Summary ]

• Expanded Custom mode modal to take into account multiple gpu devices
• Expanded and adjusted max_gpu_threads and correlated fields on frontend and backend
• Fixed parsing gpu_status.json in gpu_miner
• Changed passed value to grid_size to include multiple gpu devices

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[ What is left to do ]

• Test it on wider range of devices

[brianp]

I know it's still in draft but I was trying it out and saw something funny. Although this time it did appear that the gpuminer was running, and wasn't being restarted.

[Misieq01]

I know it's still in draft but I was trying it out and saw something funny. Although this time it did appear that the gpuminer was running, and wasn't being restarted.

Oh, good catch, I'll fix it quickly

[Misieq01]

Tested on:
Ubuntu with rtx4080 and integrated amd gpu => Works
Windows with rtx4060 and integrated intel gpu => Works
Apple m1 => Not working ( But from what I see it does not work on any branch )

[Tas4tari]

Tested on Windows 11, app version 0.7.2. In Custome mode, I do see my individual GPU devices however even when adjusting them, my GPU Power still shows as null on the mining widget and I still see warnings in the logs: