Add RISCV Support

[liberodark]

Hi,

Can you add support for riscv64 ?

Have see this issue from lance-core dependancy

       > error[E0308]: mismatched types
       >   --> /build/semcode-0.1.1-vendor/source-registry-0/lance-core-3.0.1/src/utils/cpu.rs:20:67
       >    |
       > 20 |   pub static SIMD_SUPPORT: LazyLock<SimdSupport> = LazyLock::new(|| {
       >    |  ___________________________________________________________________^
       > 21 | |     #[cfg(all(target_arch = "aarch64", any(target_os = "ios", target_os = "tvos")))]
       > ...  |
       > 61 | | });
       >    | |_^ expected `SimdSupport`, found `()`

Best Regards