Refactor Settings Indexing process

**Changes:**
The transform structure is now relying on FieldIdMapWithMetadata and AttributePatterns to prepare
the obkv documents during a settings reindexing.
The InnerIndexSettingsDiff and InnerIndexSettings structs are now relying on FieldIdMapWithMetadata, FilterableAttributesRule and AttributePatterns to define the field and the databases that should be reindexed.
The faceted_fields_ids, localized_searchable_fields_ids and localized_faceted_fields_ids have been removed in favor of the FieldIdMapWithMetadata.
We are now relying on the FieldIdMapWithMetadata to retain vectors_fids from the facets and the searchables.

The searchable database computing is now relying on the FieldIdMapWithMetadata to know if a field is searchable and retrieve the locales.

The facet database computing is now relying on the FieldIdMapWithMetadata to compute the facet databases, the facet-search and retrieve the locales.

The facet level database computing is now relying on the FieldIdMapWithMetadata and the facet level database are cleared depending on the settings differences (clear_facet_levels_based_on_settings_diff).

The vector point extraction uses the FieldIdMapWithMetadata instead of FieldsIdsMapWithMetadata.

**Impact:**
- Dump import
- Settings update

crates/milli/src/update/del_add.rs

@@ -81,6 +81,17 @@ pub enum DelAddOperation {
     DeletionAndAddition,
 }
 
+impl DelAddOperation {
+    /// Merge two DelAddOperation enum variants.
+    pub fn merge(self, other: Self) -> Self {
+        match (self, other) {
+            (Self::Deletion, Self::Deletion) => Self::Deletion,
+            (Self::Addition, Self::Addition) => Self::Addition,
+            _ => Self::DeletionAndAddition,
+        }
+    }
+}
+
 /// Creates a Kv<K, Kv<DelAdd, value>> from two Kv<K, value>
 ///
 /// putting each deletion obkv's keys under an DelAdd::Deletion