chore: Move iOS sample project to sample directory

- Relocated the `iosSample` project into the `sample/` directory to improve project structure.
- Deleted a redundant user-specific Xcode scheme file.
- Cleaned up `xcschememanagement.plist` by removing the manual `iosApp.xcscheme` entry.

Author: softartdev

sample/iosSample/iosApp.xcodeproj/project.pbxproj

@@ -175,7 +175,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if [ \"YES\" = \"$OVERRIDE_KOTLIN_BUILD_IDE_SUPPORTED\" ]; then\n  echo \"Skipping Gradle build task invocation due to OVERRIDE_KOTLIN_BUILD_IDE_SUPPORTED environment variable set to \\\"YES\\\"\"\n  exit 0\nfi\ncd \"$SRCROOT/..\"\n./gradlew :sample:ios:embedAndSignAppleFrameworkForXcode\n";
+			shellScript = "if [ \"YES\" = \"$OVERRIDE_KOTLIN_BUILD_IDE_SUPPORTED\" ]; then\n  echo \"Skipping Gradle build task invocation due to OVERRIDE_KOTLIN_BUILD_IDE_SUPPORTED environment variable set to \\\"YES\\\"\"\n  exit 0\nfi\ncd \"$SRCROOT/../..\"\n./gradlew :sample:ios:embedAndSignAppleFrameworkForXcode\n";
 		};
 /* End PBXShellScriptBuildPhase section */