added functions to enable access to debug knobs from kotlin side + docs

docs/user/AddingDebugKnobs.md

@@ -38,6 +38,7 @@ Common advantages recap:
 Use the `Settings::getDebugKnobAt(u8 i)` function to check if a specific bit is set:
 
 ```cpp
+//cpp side
 #include "common/settings.h"
 
 // Check if bit 0 is set
@@ -47,6 +48,14 @@ bool feature_enabled = Settings::getDebugKnobAt(0);
 bool another_feature = Settings::getDebugKnobAt(15);
 ```
 
+```kotlin
+//kotlin side
+import org.yuzu.yuzu_emu.features.settings.model.Settings
+
+// Check if bit x is set
+bool feature_enabled = Settings.getDebugKnobAt(x); //x as integer from 0 to 15
+``
+
 The function returns `true` if the specified bit (0-15) is set in the `debug_knobs` value, `false` otherwise.
 
 ### Setting Debug Knobs (user side)

src/android/app/src/main/java/org/yuzu/yuzu_emu/NativeLibrary.kt

@@ -200,6 +200,8 @@ object NativeLibrary {
 
     external fun logSettings()
 
+    external fun getDebugKnobAt(index: Int): Boolean
+
     /**
      * Returns Vulkan driver version / API version / GPU model
      */

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/Settings.kt

@@ -33,6 +33,10 @@ object Settings {
     fun getPlayerString(player: Int): String =
         YuzuApplication.appContext.getString(R.string.preferences_player, player)
 
+    fun getDebugKnobAt(index: Int): Boolean {
+        return org.yuzu.yuzu_emu.NativeLibrary.getDebugKnobAt(index)
+    }
+
     const val PREF_FIRST_APP_LAUNCH = "FirstApplicationLaunch"
     const val PREF_SHOULD_SHOW_DRIVER_WARNING = "ShouldShowDriverWarning"
     const val PREF_MEMORY_WARNING_SHOWN = "MemoryWarningShown"

src/android/app/src/main/jni/native.cpp

@@ -1113,6 +1113,10 @@ void Java_org_yuzu_yuzu_1emu_NativeLibrary_logSettings(JNIEnv* env, jobject jobj
     Settings::LogSettings();
 }
 
+jboolean Java_org_yuzu_yuzu_1emu_NativeLibrary_getDebugKnobAt(JNIEnv* env, jobject jobj, jint index) {
+    return static_cast<jboolean>(Settings::getDebugKnobAt(static_cast<u8>(index)));
+}
+
 void Java_org_yuzu_yuzu_1emu_NativeLibrary_run(JNIEnv* env, jobject jobj, jstring j_path,
                                                jint j_program_index,
                                                jboolean j_frontend_initiated) {