Fix Xcode 11 errors in SPM project

[dstranz]

Goals ⚽

• Fix build errors in SPM project

Implementation Details 🚧

• Add missing imports

Testing Details 🔍

• Open Package.swift file in Xcode 11

[codecov-io]

Codecov Report

Merging #4048 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4048   +/-   ##
=======================================
  Coverage   40.14%   40.14%           
=======================================
  Files         119      119           
  Lines       13985    13985           
=======================================
  Hits         5614     5614           
  Misses       8371     8371

Impacted Files	Coverage Δ
...rce/Charts/Renderers/YAxisRendererRadarChart.swift	0% <ø> (ø)	⬆️
Source/Charts/Utils/ChartUtils.swift	57.51% <ø> (ø)	⬆️
Source/Charts/Charts/PieChartView.swift	58.98% <ø> (ø)	⬆️
Source/Charts/Components/MarkerView.swift	0% <ø> (ø)	⬆️
Source/Charts/Renderers/PieChartRenderer.swift	51.38% <ø> (ø)	⬆️
Source/Charts/Utils/Platform+Accessibility.swift	37.93% <ø> (ø)	⬆️
Source/Charts/Jobs/AnimatedViewPortJob.swift	0% <ø> (ø)	⬆️
Source/Charts/Charts/BarLineChartViewBase.swift	25.81% <ø> (ø)	⬆️
Source/Charts/Charts/PieRadarChartViewBase.swift	19.95% <ø> (ø)	⬆️
Source/Charts/Components/YAxis.swift	91.89% <ø> (ø)	⬆️
... and 8 more

---

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[thierryH91200]

import Foundation is useless it's in AppKIt and UIKit

import CoreGraphics
 
#if canImport(AppKit)
import AppKit
#else
import UIKit
#endif

import Foundation
import UIKit.DocumentManager
import UIKit.NSAttributedString
import UIKit.NSDataAsset
import UIKit.NSFileProviderExtension
import UIKit.NSIndexPath_UIKitAdditions
import UIKit.NSItemProvider_UIKitAdditions

and

import AppKit.NSWindow
import AppKit.NSWindowController
import AppKit.NSWindowRestoration
import AppKit.NSWindowScripting
import AppKit.NSWindowTab
import AppKit.NSWindowTabGroup
import AppKit.NSWorkspace
import Foundation

[liuxuan30]

dup to #4017