Add support functions for accessing arroy writers and readers

milli/src/vector/mod.rs

@@ -442,3 +442,9 @@ impl DistributionShift {
 pub const fn is_cuda_enabled() -> bool {
     cfg!(feature = "cuda")
 }
+
+pub fn arroy_db_range_for_embedder(embedder_id: u8) -> impl Iterator<Item = u16> {
+    let embedder_id = (embedder_id as u16) << 8;
+
+    (0..=u8::MAX).map(move |k| embedder_id | (k as u16))
+}