[Kotlin] Control the generation of reflection with --reflect-names (#7775)

* [Kotlin] Control the generation of reflection with --reflect-names.
Tested:
```
$ cmake -G "Unix Makefiles" && make && ./tests/flatc/main.py
...
KotlinTests.EnumValAttributes
 [PASSED]
KotlinTests.EnumValAttributes_ReflectNames
 [PASSED]
KotlinTests: 2 of 2 passsed
...

35 of 35 tests passed
```

* [Kotlin] Fix SampleBinary by converting Byte to UByte for ubyte fields.

* [Kotlin] Annotate all generated classes with kotlin.ExperimentalUnsignedTypes.

tests/MyGame/Example/Ability.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Ability : Struct() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {

tests/MyGame/Example/Any.kt

@@ -3,6 +3,7 @@
 package MyGame.Example
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Any_ private constructor() {
     companion object {
         const val NONE: UByte = 0u

tests/MyGame/Example/AnyAmbiguousAliases.kt

@@ -3,6 +3,7 @@
 package MyGame.Example
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class AnyAmbiguousAliases private constructor() {
     companion object {
         const val NONE: UByte = 0u

tests/MyGame/Example/AnyUniqueAliases.kt

@@ -3,6 +3,7 @@
 package MyGame.Example
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class AnyUniqueAliases private constructor() {
     companion object {
         const val NONE: UByte = 0u

tests/MyGame/Example/Color.kt

@@ -6,6 +6,7 @@ package MyGame.Example
  * Composite components of Monster color.
  */
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Color private constructor() {
     companion object {
         const val Red: UByte = 1u

tests/MyGame/Example/LongEnum.kt

@@ -3,6 +3,7 @@
 package MyGame.Example
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class LongEnum private constructor() {
     companion object {
         const val LongOne: ULong = 2UL

tests/MyGame/Example/Monster.kt

@@ -22,6 +22,7 @@ import kotlin.math.sign
  * an example documentation comment: "monster object"
  */
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Monster : Table() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {

tests/MyGame/Example/Race.kt

@@ -3,6 +3,7 @@
 package MyGame.Example
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Race private constructor() {
     companion object {
         const val None: Byte = -1

tests/MyGame/Example/Referrable.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Referrable : Table() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {

tests/MyGame/Example/Stat.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Stat : Table() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {

tests/MyGame/Example/StructOfStructs.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class StructOfStructs : Struct() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {

tests/MyGame/Example/StructOfStructsOfStructs.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class StructOfStructsOfStructs : Struct() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {

tests/MyGame/Example/Test.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Test : Struct() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {

tests/MyGame/Example/TestSimpleTableWithEnum.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class TestSimpleTableWithEnum : Table() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {

tests/MyGame/Example/TypeAliases.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class TypeAliases : Table() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {

tests/MyGame/Example/Vec3.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Vec3 : Struct() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {