feat: port Analysis.InnerProductSpace.Adjoint (#4476)

Co-authored-by: Jireh Loreaux <loreaujy@gmail.com>

Author: int-y1

Mathlib.lean

@@ -493,6 +493,7 @@ import Mathlib.Analysis.Convex.StrictConvexSpace
 import Mathlib.Analysis.Convex.Topology
 import Mathlib.Analysis.Convex.Uniform
 import Mathlib.Analysis.Hofer
+import Mathlib.Analysis.InnerProductSpace.Adjoint
 import Mathlib.Analysis.InnerProductSpace.Basic
 import Mathlib.Analysis.InnerProductSpace.ConformalLinearMap
 import Mathlib.Analysis.InnerProductSpace.Dual