IGNITE-22524 .NET: Add JobDescriptor to Compute API

[ptupitsyn]

Add JobDescriptor parameter object to Compute API.

Usage Examples

// Provide all details
var job = new JobDescriptor("org.apache.ignite.MyJob")
{
    Options = JobExecutionOptions.Default with
    {
        Priority = 999,
        MaxRetries = 66
    },
    DeploymentUnits = new DeploymentUnit[] { new("unit1", "1.0.0") }
};

await client.Compute.SubmitAsync<string>(nodes, job)

// Only job class name
await client.Compute.SubmitAsync<string>(nodes, new("org.apache.ignite.MyJob"))

// Job and units
await client.Compute.SubmitAsync<string>(nodes, new("org.apache.ignite.MyJob", units))