feat: set message for multiple revsets

Allows to set the revision message of multiple revisions by passing
them as arguments. This only supports simple revisions, such as `@`,
`@-`, `xs`, and so on. Comple revisions such as `@..@-` are not
supported.

Fixes: #5

Cargo.toml

@@ -33,6 +33,7 @@ thiserror = "2.0.18"
 tokio = { version = "1.49.0", features = ["macros", "rt-multi-thread"] }
 textwrap = "0.16.2"
 unicode-width = "0.2.2"
+chrono = "0.4.44"
 
 [dev-dependencies]
 assert_cmd = "2.1.2"