build(unordered-dense): testing faster map implimentation

testing the unordered-dense map implimentation

build-config/meson.build

@@ -13,8 +13,8 @@ subdir('eigen')
 
 subdir('json')
 
-
 subdir('CLI11')
+subdir('unordered_dense')
 
 if get_option('use_mimalloc')
   subdir('mimalloc')

build-config/unordered_dense/meson.build

@@ -0,0 +1,5 @@
+uod_sp = cmake.subproject(
+    'unordered_dense'
+)
+
+uod_dep = uod_sp.dependency('unordered_dense')