feat(net): ApiUpload ^& fix unfired finished signals

Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>

launcher/net/ApiUpload.h

@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  Prism Launcher - Minecraft Launcher
+ *  Copyright (C) 2023 Rachel Powers <508861+Ryex@users.noreply.github.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#pragma once
+
+#include "ApiHeaderProxy.h"
+#include "Upload.h"
+
+namespace Net {
+
+class ApiUpload : public Upload {
+   public:
+    virtual ~ApiUpload() = default;
+
+    static Upload::Ptr makeByteArray(QUrl url, QByteArray* output, QByteArray m_post_data);
+
+    void init() override;
+};
+
+}  // namespace Net