fix: Fix unresolved imports for sha2 and DigestEngine, add Enum macro, remove unused imports

src/digest_engine.rs

@@ -1,8 +1,5 @@
 use std::io;
-use std::path::PathBuf;
 
-use log::*;
-use strum::IntoEnumIterator;
 
 pub mod none;
 pub mod sha2;
@@ -12,6 +9,8 @@ use crate::digest_engine::none::DigestEngineNone;
 use crate::digest_engine::sha2::DigestEngineSha256;
 use crate::digest_engine::program::DigestEngineProgram;
 
+use enum_map::Enum;
+
 #[derive(Debug, Eq, PartialEq, Clone, strum::EnumIter, strum::Display, strum::EnumString, Enum)]
 #[strum(ascii_case_insensitive)]
 pub enum DigestType {