entity-manager: probe: add support for bytestrings

Add support for bytestrings, and associated unit tests.

Change-Id: I1307b886494784ee3cd510351626297c43c431d6
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/include/Utils.hpp b/include/Utils.hpp
index 6e663e6..8ac27a1 100644
--- a/include/Utils.hpp
+++ b/include/Utils.hpp
@@ -32,7 +32,7 @@
 
 using BasicVariantType =
     std::variant<std::string, int64_t, uint64_t, double, int32_t, uint32_t,
-                 int16_t, uint16_t, uint8_t, bool>;
+                 int16_t, uint16_t, uint8_t, bool, std::vector<uint8_t>>;
 
 enum class TemplateOperation
 {