[PM-22263] Integate Rust SDK to Seeder (#6150)

Adds a Rust SDK for performing seed related cryptograhic operations. It depends on internal portions of our Rust SDK. Primarily parts of the bitwarden-crypto crate.

util/RustSdk/rust/build.rs

@@ -0,0 +1,9 @@
+fn main() {
+    csbindgen::Builder::default()
+        .input_extern_file("src/lib.rs")
+        .csharp_dll_name("libsdk")
+        .csharp_namespace("Bit.RustSDK")
+        .csharp_class_accessibility("public")
+        .generate_csharp_file("../NativeMethods.g.cs")
+        .unwrap();
+}