Split out some BLS stuff into a separate testable crate without UEFI types

crates/bls/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "edera-sprout-bls"
+description = "Sprout BLS Utilities"
+license.workspace = true
+version.workspace = true
+homepage.workspace = true
+repository.workspace = true
+edition.workspace = true
+
+[dependencies]
+anyhow.workspace = true
+
+[lib]
+name = "edera_sprout_bls"
+path = "src/lib.rs"