feat: Added is_guild_owner for dpp::guild_member

include/dpp/guild.h

@@ -520,6 +520,14 @@ class DPP_EXPORT guild_member : public json_interface<guild_member> {
 	 */
 	bool has_rejoined() const;
 
+	/**
+	 * @brief Is this user also the guild member?
+	 * @return true if the user is the guild owner.
+	 * @return false if the user is not the guild owner or the guild is not in the cache.
+	 * @note If the guild cache is disabled, this function will always return false.
+	 */
+	bool is_guild_owner() const;
+
 	/**
 	 * @brief Returns true if the user has completed onboarding
 	 *

src/dpp/guild.cpp

@@ -347,6 +347,11 @@ bool guild_member::has_rejoined() const {
 	return flags & dpp::gm_did_rejoin;
 }
 
+bool guild_member::is_guild_owner() const {
+	auto* _guild = find_guild(guild_id);
+	return _guild != nullptr && _guild->owner_id == this->user_id;
+}
+
 bool guild_member::has_completed_onboarding() const {
 	return flags & dpp::gm_completed_onboarding;
 }