feat: reward codes

this is for giving rewards across characters as the did in live.
Tested that the default config works
Tested that all claim codes work
Tested that saving and loading claim codes work
Tested that mail sends correctly

dDatabase/GameDatabase/ITables/IAccountsRewardCodes.h

@@ -0,0 +1,12 @@
+#ifndef __IACCOUNTSREWARDCODES__H__
+#define __IACCOUNTSREWARDCODES__H__
+
+#include <cstdint>
+#include <vector>
+
+class IAccountsRewardCodes {
+public:
+	virtual void InsertRewardCode(const uint32_t account_id, const uint32_t reward_code) = 0;
+	virtual std::vector<uint32_t> GetRewardCodesByAccountID(const uint32_t account_id) = 0;
+};
+#endif  //!__IACCOUNTSREWARDCODES__H__