feat: Introduce signed, verifiable entries with protobuf definitions, cryptographic signing, and hashing, updating the data model and architecture.

lattice-core/build.rs

@@ -0,0 +1,9 @@
+use std::io::Result;
+
+fn main() -> Result<()> {
+    prost_build::compile_protos(
+        &["../proto/lattice.proto"],
+        &["../proto/"],
+    )?;
+    Ok(())
+}