IVGCVSW-6498 Add Support for Batch MatMul to TfLite Delegate

 * Creates delegate/src/BatchMatMul.hpp
 * Add VisitBatchMatMul function
 * Add BatchMatMul to switch in armnn_delegate
 * Creates delegate/src/test/BatchMatMulTest.cpp
 * Creates delegate/src/test/BatchMatMulTestHelper.hpp
 * Add Int8 and Fp32 unit tests on ref backend
 * Add BatchMatMul to delegate supported ops

Signed-off-by: Ryan OShea <ryan.oshea3@arm.com>
Change-Id: I50e61314cf063f986c8a0f7d508847a96953735e
diff --git a/docs/05_03_delegate.dox b/docs/05_03_delegate.dox
index ee80268..9d92627 100644
--- a/docs/05_03_delegate.dox
+++ b/docs/05_03_delegate.dox
@@ -45,6 +45,8 @@
 
 - AVERAGE_POOL_3D
 
+- BATCH_MATMUL
+
 - BATCH_TO_SPACE_ND
 
 - CAST