Remove strum crate dependency; add protobuf nix dependency

Cargo.lock

@@ -887,8 +887,6 @@ dependencies = [
  "serde_bytes",
  "serde_json",
  "sha2",
- "strum",
- "strum_macros",
  "tokio",
  "tracing",
  "url",
@@ -2858,25 +2856,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "strum"
-version = "0.23.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cae14b91c7d11c9a851d3fbc80a963198998c2a64eec840477fa92d8ce9b70bb"
-
-[[package]]
-name = "strum_macros"
-version = "0.23.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5bb0dc7ee9c15cea6199cde9a127fa16a4c5819af85395457ad72d68edc85a38"
-dependencies = [
- "heck",
- "proc-macro2",
- "quote",
- "rustversion",
- "syn",
-]
-
 [[package]]
 name = "subtle"
 version = "2.4.1"