[iOS] Expose private api for MBX Image creation. (#11969)

In the scope of road cameras implementation we need to use this API for
icons customization.

- mapbox/navigation#13612
- mapbox/mapbox-sdk#7678

cc @mapbox/maps-ios

cc @mapbox/gl-native

---------

Co-authored-by: Changelog autocreator bot <github-actions[bot]@users.noreply.github.com>
GitOrigin-RevId: 08e5672d335ab3b795796ccb9aa5dd08bdfa74ab

Author: ArtemStepuk

Sources/MapboxMaps/ContentBuilders/MapStyleContent/MapStyleMountedComponents.swift

@@ -1,5 +1,5 @@
 import os.log
-@_spi(Marshalling) import MapboxCoreMaps
+@_spi(Marshalling) @_spi(Internal) import MapboxCoreMaps
 
 struct MountedLayer<L>: MapContentMountedComponent where L: Layer, L: Equatable {
     var layer: L

Sources/MapboxMaps/Foundation/Extensions/Image.swift

@@ -1,5 +1,5 @@
 import UIKit
-@_spi(Marshalling) import MapboxCoreMaps
+@_spi(Marshalling) @_spi(Internal) import MapboxCoreMaps
 
 /// Map color theme.
 ///

Sources/MapboxMaps/Style/ColorTheme.swift

@@ -1,3 +1,4 @@
+@_spi(Internal) import MapboxCoreMaps
 import UIKit
 
 extension CustomRasterSourceTileData {

Sources/MapboxMaps/Style/CustomSources/CustomRasterSourceTileData+Extensions.swift

@@ -1,7 +1,7 @@
 // swiftlint:disable file_length
 @_implementationOnly import MapboxCommon_Private
 import UIKit
-@_spi(Marshalling) import MapboxCoreMaps
+@_spi(Marshalling) @_spi(Internal) import MapboxCoreMaps
 
 protocol StyleProtocol: AnyObject {
     var isStyleLoaded: Bool { get }

Sources/MapboxMaps/Style/StyleManager.swift

@@ -1,6 +1,7 @@
 import XCTest
 import CoreLocation
 import UIKit
+@_spi(Internal) import MapboxCoreMaps
 @testable import MapboxMaps
 
 class MapboxMapsFoundationTests: XCTestCase {

Tests/MapboxMapsTests/Foundation/MapboxMapsFoundationTests.swift

@@ -1,5 +1,5 @@
 import XCTest
-import MapboxCoreMaps
+@_spi(Internal) import MapboxCoreMaps
 @testable import MapboxMaps
 
 final class ImageTests: XCTestCase {