[serialization_lib] Add tosa shape ops

Added tosa shape ops to tosa.fbs
also added convert I64 to and from U8 for storing const_shape data values

Signed-off-by: Tai Ly <tai.ly@arm.com>
Change-Id: I1e938dec7398fbcbe5be657dad65cdd61af5b597
diff --git a/schema/tosa.fbs b/schema/tosa.fbs
index 1975667..171818d 100644
--- a/schema/tosa.fbs
+++ b/schema/tosa.fbs
@@ -1,5 +1,5 @@
 
-// Copyright (c) 2020-2023, ARM Limited.
+// Copyright (c) 2020-2024, ARM Limited.
 //
 //    Licensed under the Apache License, Version 2.0 (the "License");
 //    you may not use this file except in compliance with the License.
@@ -119,6 +119,12 @@
   RFFT2D,
   ERF,
   DIM,
+  CONST_SHAPE,
+  CONCAT_SHAPE,
+  ADD_SHAPE,
+  SUB_SHAPE,
+  MUL_SHAPE,
+  DIV_SHAPE,
 }
 
 union Attribute {