Move crates under a sub folder to clean up the code

milli/src/update/update_step.rs

@@ -1,35 +0,0 @@
-use UpdateIndexingStep::*;
-
-#[derive(Debug, Clone, Copy)]
-pub enum UpdateIndexingStep {
-    /// Remap document addition fields the one present in the database, adding new fields in to the
-    /// schema on the go.
-    RemapDocumentAddition { documents_seen: usize },
-
-    /// This step check the external document id, computes the internal ids and merge
-    /// the documents that are already present in the database.
-    ComputeIdsAndMergeDocuments { documents_seen: usize, total_documents: usize },
-
-    /// Extract the documents words using the tokenizer and compute the documents
-    /// facets. Stores those words, facets and documents ids on disk.
-    IndexDocuments { documents_seen: usize, total_documents: usize },
-
-    /// Merge the previously extracted data (words and facets) into the final LMDB database.
-    /// These extracted data are split into multiple databases.
-    MergeDataIntoFinalDatabase { databases_seen: usize, total_databases: usize },
-}
-
-impl UpdateIndexingStep {
-    pub const fn step(&self) -> usize {
-        match self {
-            RemapDocumentAddition { .. } => 0,
-            ComputeIdsAndMergeDocuments { .. } => 1,
-            IndexDocuments { .. } => 2,
-            MergeDataIntoFinalDatabase { .. } => 3,
-        }
-    }
-
-    pub const fn number_of_steps(&self) -> usize {
-        4
-    }
-}