very basic validator functionality

[mattdf]

Implement #55

[JannikSt]

Is this only supporting GPUs? Should also be doable by a normal CPU I assume?
Something is not working on my local test - I see that the requests actually come in on the node. Validator:

[INFO  validator] Non validated nodes: [DiscoveryNode { node: Node { id: "0x66295E2B4A78d1Cb57Db16Ac0260024900A5BA9B", provider_address: "0xC489fabaA6a5D4A49dF0aa590a779880C75fC405", ip_address: "0.0.0.0", port: 8091, compute_pool_id: 0, compute_specs: Some(ComputeSpecs { gpu: None, cpu: Some(CpuSpecs { cores: Some(14), model: Some("Apple M3 Max") }), ram_mb: Some(36864), storage_gb: Some(926), storage_path: None }) }, is_validated: false, is_active: false }]
Challenge request: ChallengeRequest { rows_a: 3, cols_a: 3, data_a: [0.7293360311008195, 0.957463411875078, 0.39101130831465003, 0.32466191530271304, 0.6706602400858217, 0.9622708286095232, 0.6070233504229647, 0.05688881081728603, 0.4935405642773578], rows_b: 3, cols_b: 3, data_b: [0.890868105602634, 0.18381199647220914, 0.382563260782925, 0.3713313899316728, 0.18018971621669455, 0.27968305311288244, 0.7960309243217891, 0.9931346929402032, 0.21043724085438886] }
Challenge post url: http://0.0.0.0:8091/challenge/submit
Challenge response: Response { url: "http://0.0.0.0:8091/challenge/submit", status: 400, headers: {"content-length": "17", "content-type": "text/plain; charset=utf-8", "date": "Wed, 12 Feb 2025 01:51:53 GMT"} }
[ERROR validator] Failed to challenge node 0x66295E2B4A78d1Cb57Db16Ac0260024900A5BA9B: Err(Error("expected value", line: 1, column: 1))