refactor: split backup and alex into separate crate; set up workspace

Cargo.lock

@@ -10,16 +10,14 @@ checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
 [[package]]
 name = "alex"
-version = "0.4.1"
+version = "0.4.2"
 dependencies = [
+ "backup",
  "chrono",
  "clap",
  "figment",
- "flate2",
  "serde",
- "serde_json",
  "signal-hook",
- "tar",
 ]
 
 [[package]]
@@ -98,6 +96,17 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "backup"
+version = "0.4.2"
+dependencies = [
+ "chrono",
+ "flate2",
+ "serde",
+ "serde_json",
+ "tar",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"