Add ColorRenderingMode implementation (#138)

Sources/OpenSwiftUICore/Render/ColorRenderingMode.swift

@@ -0,0 +1,58 @@
+//
+//  ColorRenderingMode.swift
+//  OpenSwiftUICore
+//
+//  Audited for RELEASE_2024
+//  Status: Complete
+
+/// The set of possible working color spaces for color-compositing operations.
+///
+/// Each color space guarantees the preservation of a particular range of color
+/// values.
+public enum ColorRenderingMode: Sendable {
+    /// The non-linear sRGB working color space.
+    ///
+    /// Color component values outside the range `[0, 1]` produce undefined
+    /// results. This color space is gamma corrected.
+    case nonLinear
+
+    /// The linear sRGB working color space.
+    ///
+    /// Color component values outside the range `[0, 1]` produce undefined
+    /// results. This color space isn't gamma corrected.
+    case linear
+
+    /// The extended linear sRGB working color space.
+    ///
+    /// Color component values outside the range `[0, 1]` are preserved.
+    /// This color space isn't gamma corrected.
+    case extendedLinear
+}
+
+extension ColorRenderingMode: Equatable {}
+extension ColorRenderingMode: Hashable {}
+
+extension ColorRenderingMode: ProtobufEnum {
+    package var protobufValue: UInt {
+        switch self {
+        case .nonLinear:
+            return 0
+        case .linear:
+            return 1
+        case .extendedLinear:
+            return 2
+        }
+    }
+    package init?(protobufValue value: UInt) {
+        switch value {
+        case 0:
+            self = .nonLinear
+        case 1:
+            self = .linear
+        case 2:
+            self = .extendedLinear
+        default:
+            return nil
+        }
+    }
+}