refactor: RHI抽象层测试支持参数化

- 将RHITestFixture改为TestWithParam<RHIType>，支持D3D12和OpenGL双后端
- 重构RHIFactory.cpp的include结构，修复OpenGL设备创建
- 在CMakeLists.txt中添加XCENGINE_SUPPORT_OPENGL宏定义
- 更新engine/CMakeLists.txt和tests/RHI/unit/CMakeLists.txt
- 将所有TEST_F改为TEST_P以支持参数化测试

测试结果: 138 tests (D3D12: 58 passed / OpenGL: 48 passed)

tests/RHI/unit/test_texture.cpp

@@ -3,7 +3,7 @@
 
 using namespace XCEngine::RHI;
 
-TEST_F(RHITestFixture, Texture_Create_Texture2D) {
+TEST_P(RHITestFixture, Texture_Create_Texture2D) {
     TextureDesc desc = {};
     desc.width = 512;
     desc.height = 512;
@@ -30,7 +30,7 @@ TEST_F(RHITestFixture, Texture_Create_Texture2D) {
     delete texture;
 }
 
-TEST_F(RHITestFixture, Texture_Create_Texture3D) {
+TEST_P(RHITestFixture, Texture_Create_Texture3D) {
     TextureDesc desc = {};
     desc.width = 64;
     desc.height = 64;
@@ -51,7 +51,7 @@ TEST_F(RHITestFixture, Texture_Create_Texture3D) {
     delete texture;
 }
 
-TEST_F(RHITestFixture, Texture_StateManagement) {
+TEST_P(RHITestFixture, Texture_StateManagement) {
     TextureDesc desc = {};
     desc.width = 256;
     desc.height = 256;
@@ -69,7 +69,7 @@ TEST_F(RHITestFixture, Texture_StateManagement) {
     delete texture;
 }
 
-TEST_F(RHITestFixture, Texture_Naming) {
+TEST_P(RHITestFixture, Texture_Naming) {
     TextureDesc desc = {};
     desc.width = 256;
     desc.height = 256;
@@ -86,7 +86,7 @@ TEST_F(RHITestFixture, Texture_Naming) {
     delete texture;
 }
 
-TEST_F(RHITestFixture, Texture_GetNativeHandle) {
+TEST_P(RHITestFixture, Texture_GetNativeHandle) {
     TextureDesc desc = {};
     desc.width = 256;
     desc.height = 256;