Add Rust convenience macros for loading

[EricLBuehler]

use mistralrs::{device, load_normal_model};
fn main() -> anyhow::Result<()> {
    let dev = Device::cuda_if_available(0)?;
    let runner = load_normal_model!(
        id = "mistralai/Mistral-7B-Instruct-v0.1".to_string(),
        kind = Mistral,
        device = dev,
        use_flash_attn = false
    );
    Ok(())
}

[github-actions[bot]]

Code Metrics Report

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 Language            Files        Lines         Code     Comments       Blanks
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 Dockerfile              1           34           25            0            9
 Happy                   1          442          369            0           73
 JSON                    9           21           21            0            0
 Python                 32         1256         1075           37          144
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 Markdown               17         1297            0          965          332
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 |- Rust                 3          151          135            6           10
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 Rust                  119        36038        32599          623         2816
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 (Total)                          36696        32612         1231         2853
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 Total                 197        39532        34492         1626         3414
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