Update Submit Test event feature to send custom data

Changes Added : Updated the submit test event feature to send test
data as per spec

https://www.dmtf.org/sites/default/files/standards/documents/
DSP2046_2019.1.pdf


Testing :

Tested sending custom test data
and same data received at the event listener
Change-Id: I2c2363a676aafd39c121c9fe4e16402c0f5961e2
Signed-off-by: Chandramohan Harkude <chandramohan.harkude@gmail.com>
diff --git a/meson.build b/meson.build
index 093e60f..d3833bc 100644
--- a/meson.build
+++ b/meson.build
@@ -436,6 +436,7 @@
     'test/include/str_utility_test.cpp',
     'test/redfish-core/include/event_log_test.cpp',
     'test/redfish-core/include/event_matches_filter_test.cpp',
+    'test/redfish-core/include/submit_test_event_test.cpp',
     'test/redfish-core/include/filter_expr_executor_test.cpp',
     'test/redfish-core/include/filter_expr_parser_test.cpp',
     'test/redfish-core/include/privileges_test.cpp',