chore: remove unused linkage.union and linkage.intersection

The model of combining Linkages I think is the wrong abstraction. I think this actually happen at the level of combining linkers.

Author: NickCrews

mismo/__init__.py

@@ -23,7 +23,6 @@
 from mismo._datasets import Datasets as Datasets
 from mismo._explain import explain as explain
 from mismo._n_naive import n_naive_comparisons as n_naive_comparisons
-from mismo._recipe import PRecipe as PRecipe
 from mismo.joins import HasJoinCondition as HasJoinCondition
 from mismo.joins import IntoJoinCondition as IntoJoinCondition
 from mismo.joins import join as join

mismo/linkage/_dimension.py mismo/_dimension.pymismo/linkage/_dimension.py renamed to mismo/_dimension.py

@@ -1,11 +1,5 @@
 from __future__ import annotations
 
-from mismo.linkage._combine import difference as difference
-from mismo.linkage._combine import intersect as intersect
-from mismo.linkage._combine import (
-    unify_links_min_intersection as unify_links_min_intersection,
-)
-from mismo.linkage._combine import union as union
 from mismo.linkage._linkage import Linkage as Linkage
 from mismo.linkage._linkage import filter_links as filter_links
 from mismo.linkage._sample import sample_all_links as sample_all_links