Core: Add connect_entrances world step/stage (#4420)

* Add connect_entrances

* update ER docs

* fix that test, but also ew

* Add a test that asserts the new finalization

* Rewrite test a bit

* rewrite some more

* blank line

* rewrite rewrite rewrite

* rewrite rewrite rewrite

* RE. WRITE.

* oops

* Bruh

* I guess, while we're at it

* giga oops

* It's been a long day

* Switch KH1 over to this design with permission of GICU

* Revert

* Oops

* Bc I like it

* Update locations.py

test/benchmark/locations.py

@@ -18,7 +18,15 @@ def run_locations_benchmark():
 
     class BenchmarkRunner:
         gen_steps: typing.Tuple[str, ...] = (
-            "generate_early", "create_regions", "create_items", "set_rules", "generate_basic", "pre_fill")
+            "generate_early",
+            "create_regions",
+            "create_items",
+            "set_rules",
+            "connect_entrances",
+            "generate_basic",
+            "pre_fill",
+        )
+
         rule_iterations: int = 100_000
 
         if sys.version_info >= (3, 9):