feat: port Analysis.BoxIntegral.Partition.Basic (#3438)

Co-authored-by: Jeremy Tan Jie Rui <reddeloostw@gmail.com>
Co-authored-by: int-y1 <jason_yuen2007@hotmail.com>

Author: 3 people

Mathlib.lean

@@ -330,6 +330,7 @@ import Mathlib.Analysis.Asymptotics.SuperpolynomialDecay
 import Mathlib.Analysis.Asymptotics.Theta
 import Mathlib.Analysis.BoxIntegral.Box.Basic
 import Mathlib.Analysis.BoxIntegral.Box.SubboxInduction
+import Mathlib.Analysis.BoxIntegral.Partition.Basic
 import Mathlib.Analysis.Convex.Basic
 import Mathlib.Analysis.Convex.Body
 import Mathlib.Analysis.Convex.Caratheodory