app version to server (#7130)

- Send app version and release stage to collab on connect
- Read the new header on the server

Release Notes:

- Added the ability to collaborate with users on different releases of
Zed.

crates/util/src/semantic_version.rs

@@ -0,0 +1,46 @@
+use std::{
+    fmt::{self, Display},
+    str::FromStr,
+};
+
+use anyhow::{anyhow, Result};
+use serde::Serialize;
+
+/// A datastructure representing a semantic version number
+#[derive(Clone, Copy, Debug, Default, Eq, Ord, PartialEq, PartialOrd, Serialize)]
+pub struct SemanticVersion {
+    pub major: usize,
+    pub minor: usize,
+    pub patch: usize,
+}
+
+impl FromStr for SemanticVersion {
+    type Err = anyhow::Error;
+
+    fn from_str(s: &str) -> Result<Self> {
+        let mut components = s.trim().split('.');
+        let major = components
+            .next()
+            .ok_or_else(|| anyhow!("missing major version number"))?
+            .parse()?;
+        let minor = components
+            .next()
+            .ok_or_else(|| anyhow!("missing minor version number"))?
+            .parse()?;
+        let patch = components
+            .next()
+            .ok_or_else(|| anyhow!("missing patch version number"))?
+            .parse()?;
+        Ok(Self {
+            major,
+            minor,
+            patch,
+        })
+    }
+}
+
+impl Display for SemanticVersion {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}.{}.{}", self.major, self.minor, self.patch)
+    }
+}