feat: add endpoints for most recent pvp kills

[DarkAtra]

Adds an endpoint that returns the most recent pvp kills similar to what the player-activity endpoint does for connects and disconnects.

See: #10

[DarkAtra]

currently fails with:

[Error  :Il2CppInterop] During invoking native->managed trampoline
Exception: Il2CppInterop.Runtime.Il2CppException: System.ExecutionEngineException: Attempting to call method 'Unity.Entities.EntityManager::GetComponentData<ProjectM.VampireDownedBuff>' for which no ahead of time (AOT) code was generated.
--- BEGIN IL2CPP STACK TRACE ---
System.ExecutionEngineException: Attempting to call method 'Unity.Entities.EntityManager::GetComponentData<ProjectM.VampireDownedBuff>' for which no ahead of time (AOT) code was generated.

--- END IL2CPP STACK TRACE ---

   at Il2CppInterop.Runtime.Il2CppException.RaiseExceptionIfNecessary(IntPtr returnedException) in /home/runner/work/Il2CppInterop/Il2CppInterop/Il2CppInterop.Runtime/Il2CppException.cs:line 36
   at Unity.Entities.EntityManager.GetComponentData[T](Entity entity)
   at v_rising_discord_bot_companion.killfeed.VampireDownedServerEventSystemPatches.handleDownedEntity(Entity entity)
   at v_rising_discord_bot_companion.killfeed.VampireDownedServerEventSystemPatches.Postfix(VampireDownedServerEventSystem __instance)
   at DMD<ProjectM.VampireDownedServerEventSystem::OnUpdate>(VampireDownedServerEventSystem this)
   at (il2cpp -> managed) OnUpdate(IntPtr , Il2CppMethodInfo* )

[DarkAtra]

VWorld.Server.EntityManager.TryGetComponentData<VampireDownedBuff>(entity, out var buff); works

[github-actions]

🎉 This PR is included in version 0.4.0 🎉

The release is available on:

• v0.4.0
• GitHub release

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