Added PingRichPresence to AchievementManager

PingRichPresence makes a "ping" API request to the RetroAchievements website with the provided RichPresence string parameter. While there has been talk about tying ping in with session, in its current state the primary purpose of ping is to send the player's Rich Presence to the website.

Source/Core/Core/AchievementManager.cpp

@@ -401,6 +401,22 @@ AchievementManager::ResponseType AchievementManager::SubmitLeaderboard(Achieveme
   return r_type;
 }
 
+AchievementManager::ResponseType
+AchievementManager::PingRichPresence(const RichPresence& rich_presence)
+{
+  std::string username = Config::Get(Config::RA_USERNAME);
+  std::string api_token = Config::Get(Config::RA_API_TOKEN);
+  rc_api_ping_request_t ping_request = {.username = username.c_str(),
+                                        .api_token = api_token.c_str(),
+                                        .game_id = m_game_id,
+                                        .rich_presence = rich_presence.data()};
+  rc_api_ping_response_t ping_response = {};
+  ResponseType r_type = Request<rc_api_ping_request_t, rc_api_ping_response_t>(
+      ping_request, &ping_response, rc_api_init_ping_request, rc_api_process_ping_response);
+  rc_api_destroy_ping_response(&ping_response);
+  return r_type;
+}
+
 // Every RetroAchievements API call, with only a partial exception for fetch_image, follows
 // the same design pattern (here, X is the name of the call):
 //   Create a specific rc_api_X_request_t struct and populate with the necessary values

Source/Core/Core/AchievementManager.h

@@ -19,6 +19,8 @@
 #include "Common/WorkQueueThread.h"
 
 using AchievementId = u32;
+constexpr size_t RP_SIZE = 256;
+using RichPresence = std::array<char, RP_SIZE>;
 
 class AchievementManager
 {
@@ -65,6 +67,8 @@ private:
 
   ResponseType AwardAchievement(AchievementId achievement_id);
   ResponseType SubmitLeaderboard(AchievementId leaderboard_id, int value);
+  ResponseType PingRichPresence(const RichPresence& rich_presence);
+
   template <typename RcRequest, typename RcResponse>
   ResponseType Request(RcRequest rc_request, RcResponse* rc_response,
                        const std::function<int(rc_api_request_t*, const RcRequest*)>& init_request,