chore(Data/Complex/Exponential): split trig functions to new file (#21075)

This PR splits Data/Complex/Exponential.lean into a new Trigonometric.lean file, addressing an instance of a long file linter trigger.

Author: BoltonBailey

Mathlib.lean

@@ -2501,6 +2501,7 @@ import Mathlib.Data.Complex.FiniteDimensional
 import Mathlib.Data.Complex.Module
 import Mathlib.Data.Complex.Order
 import Mathlib.Data.Complex.Orientation
+import Mathlib.Data.Complex.Trigonometric
 import Mathlib.Data.Countable.Basic
 import Mathlib.Data.Countable.Defs
 import Mathlib.Data.Countable.Small

Mathlib/Analysis/Complex/Basic.lean

@@ -5,7 +5,7 @@ Authors: Sébastien Gouëzel
 -/
 import Mathlib.Data.Complex.Module
 import Mathlib.Data.Complex.Order
-import Mathlib.Data.Complex.Exponential
+import Mathlib.Data.Complex.Trigonometric
 import Mathlib.Analysis.RCLike.Basic
 import Mathlib.Topology.Algebra.InfiniteSum.Field
 import Mathlib.Topology.Algebra.InfiniteSum.Module

Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev.lean

@@ -3,7 +3,7 @@ Copyright (c) 2020 Johan Commelin. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johan Commelin
 -/
-import Mathlib.Data.Complex.Exponential
+import Mathlib.Data.Complex.Trigonometric
 import Mathlib.Data.Complex.Module
 import Mathlib.RingTheory.Polynomial.Chebyshev