Add bignum test generation framework

Adds python script for generation of bignum test cases, with initial
classes for mpi_cmp_mpi test cases. Build scripts are updated to
generate test data.

Signed-off-by: Werner Lewis <werner.lewis@arm.com>
diff --git a/scripts/make_generated_files.bat b/scripts/make_generated_files.bat
index 662da98..e9d9275 100644
--- a/scripts/make_generated_files.bat
+++ b/scripts/make_generated_files.bat
@@ -10,4 +10,5 @@
 python scripts\generate_ssl_debug_helpers.py || exit /b 1

 perl scripts\generate_visualc_files.pl || exit /b 1

 python scripts\generate_psa_constants.py || exit /b 1

+python tests\scripts\generate_bignum_tests.py || exit /b 1

 python tests\scripts\generate_psa_tests.py || exit /b 1