Added a check for unused imports

src/build/fs/Import.go

@@ -0,0 +1,11 @@
+package fs
+
+import "git.akyoto.dev/cli/q/src/build/token"
+
+// Import represents an import statement in a file.
+type Import struct {
+	Path     string
+	FullPath string
+	Position token.Position
+	Used     bool
+}