Add hash extractor

Cargo.lock

@@ -2016,7 +2016,6 @@ version = "0.0.2"
 dependencies = [
  "axum",
  "bytes",
- "futures-core",
  "pile-dataset",
  "reqwest",
  "serde",
@@ -2098,6 +2097,7 @@ dependencies = [
  "id3",
  "image",
  "kamadak-exif",
+ "md5",
  "mime",
  "mime_guess",
  "pdf",
@@ -2109,6 +2109,8 @@ dependencies = [
  "reqwest",
  "serde",
  "serde_json",
+ "sha1",
+ "sha2 0.11.0-rc.5",
  "smartstring",
  "strum",
  "tokio",
@@ -2654,6 +2656,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "sha1"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest 0.10.7",
+]
+
 [[package]]
 name = "sha2"
 version = "0.10.9"