feat: denort binary (#9041)

This commit adds new binary target called "denort".

It is a "lite" version of "deno" binary that can only execute
code embedded inside the binary itself.

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

cli/version.rs

@@ -10,6 +10,12 @@ pub fn deno() -> String {
   })
 }
 
+// allow(dead_code) because denort does not use this.
+#[allow(dead_code)]
 pub fn is_canary() -> bool {
   option_env!("DENO_CANARY").is_some()
 }
+
+pub fn get_user_agent() -> String {
+  format!("Deno/{}", deno())
+}