Create and manage Epic Online Services lobbies and sessions for multiplayer matchmaking

Steps

1. Initialize the EOS SDK with a platform handle; ensure the Lobby and Sessions interfaces are available via EOS_Platform_GetLobbyInterface and EOS_Platform_GetSessionsInterface respectively.
2. To create a lobby, call EOS_Lobby_CreateLobby with options specifying max members, permission level (public, friends-only, invite-only), and any initial lobby attributes.
3. Add searchable attributes to the lobby (e.g., game mode, map name) using EOS_Lobby_UpdateLobbyModification and EOS_Lobby_UpdateLobby so other players can find it via EOS_Lobby_Search.
4. For session-based matchmaking (dedicated servers), use EOS_Sessions_CreateSession and register the server's connection info as session attributes; clients search via EOS_Sessions_CreateSessionSearch.
5. Handle join flow by calling EOS_Lobby_JoinLobby or EOS_Sessions_JoinSession; the callbacks provide connection details for the chosen transport layer.
6. Destroy lobbies or sessions explicitly when the match ends using EOS_Lobby_DestroyLobby or EOS_Sessions_DestroySession to free resources and remove listings.