[TS] Fix generation of struct members in object api (#7148)

* Fix C/C++ Create<Type>Direct with sorted vectors

If a struct has a key the vector has to be sorted. To sort the vector
you can't use "const".

* Changes due to code review

* Improve code readability

* Add generate of JSON schema to string to lib

* option indent_step is supported

* Remove unused variables

* Fix break in test

* Fix style to be consistent with rest of the code

* [TS] Fix reserved words as arguments (#6955)

* [TS] Fix generation of reserved words in object api (#7106)

* [TS] Fix generation of object api

* [TS] Fix MakeCamel -> ConvertCase

* [TS] Add test for struct of struct of struct

* Update generated files

* Add missing files

* [TS] Fix query of null/undefined fields in object api

tests/MyGame/Example/StructOfStructsOfStructs.kt

@@ -0,0 +1,38 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package MyGame.Example
+
+import java.nio.*
+import kotlin.math.sign
+import com.google.flatbuffers.*
+
+@Suppress("unused")
+class StructOfStructsOfStructs : Struct() {
+
+    fun __init(_i: Int, _bb: ByteBuffer)  {
+        __reset(_i, _bb)
+    }
+    fun __assign(_i: Int, _bb: ByteBuffer) : StructOfStructsOfStructs {
+        __init(_i, _bb)
+        return this
+    }
+    val a : MyGame.Example.StructOfStructs? get() = a(MyGame.Example.StructOfStructs())
+    fun a(obj: MyGame.Example.StructOfStructs) : MyGame.Example.StructOfStructs? = obj.__assign(bb_pos + 0, bb)
+    companion object {
+        fun createStructOfStructsOfStructs(builder: FlatBufferBuilder, a_a_id: UInt, a_a_distance: UInt, a_b_a: Short, a_b_b: Byte, a_c_id: UInt, a_c_distance: UInt) : Int {
+            builder.prep(4, 20)
+            builder.prep(4, 20)
+            builder.prep(4, 8)
+            builder.putInt(a_c_distance.toInt())
+            builder.putInt(a_c_id.toInt())
+            builder.prep(2, 4)
+            builder.pad(1)
+            builder.putByte(a_b_b)
+            builder.putShort(a_b_a)
+            builder.prep(4, 8)
+            builder.putInt(a_a_distance.toInt())
+            builder.putInt(a_a_id.toInt())
+            return builder.offset()
+        }
+    }
+}