Extract SemanticVersion into its own crate (#9956)

This PR extracts the `SemanticVersion` out of `util` and into its own
`SemanticVersion` crate.

This allows for making use of `SemanticVersion` without needing to pull
in some of the heavier dependencies included in the `util` crate.

As part of this the public API for `SemanticVersion` has been tidied up
a bit.

Release Notes:

- N/A

crates/gpui/src/platform/linux/platform.rs

@@ -353,19 +353,11 @@ impl Platform for LinuxPlatform {
     }
 
     fn os_version(&self) -> Result<SemanticVersion> {
-        Ok(SemanticVersion {
-            major: 1,
-            minor: 0,
-            patch: 0,
-        })
+        Ok(SemanticVersion::new(1, 0, 0))
     }
 
     fn app_version(&self) -> Result<SemanticVersion> {
-        Ok(SemanticVersion {
-            major: 1,
-            minor: 0,
-            patch: 0,
-        })
+        Ok(SemanticVersion::new(1, 0, 0))
     }
 
     fn app_path(&self) -> Result<PathBuf> {