build: move the int/stream type mapping into a simdata module shared by the build script

src/simdata.rs

@@ -0,0 +1,29 @@
+#[derive(Debug)]
+pub enum StreamType {
+    IMU,
+    GPS,
+    Annotations
+}
+
+impl TryFrom<i8> for StreamType {    
+    type Error = ();
+    
+    fn try_from(value: i8) -> Result<Self, Self::Error> {
+        match value {
+            1 => Ok(StreamType::IMU),
+            2 => Ok(StreamType::GPS),
+            3 => Ok(StreamType::Annotations),
+            _ => Err(())
+        }
+    }
+}
+
+impl From<StreamType> for i8 {
+    fn from(value: StreamType) -> Self {
+        match value {
+            StreamType::IMU => 1,
+            StreamType::GPS => 2,
+            StreamType::Annotations => 3
+        }
+    }
+}