[vulkan, android] Initial implementation of LSFG-VK (#4263)

Pretty much self explanatory, own implementation based on LSFG-VK available with some additional reverse engineer work for the actual use of shaders inside Lossless.dll, we don't store/ bundle any tools that bypass security and self ownership: to use this feature is required to own your own copy of Lossless Scaling and I encourage to support developers behind this work.

Special thanks:

1.- THS - Original developer behind Lossless Scaling
2.- PancakeTAS - Developer behind LSFG-VK
3.- The Big Smolio The Sleeper (@gidoly)

Co-authored-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4263

src/common/fs/path_util.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
@@ -23,6 +23,7 @@ enum class EdenPath {
     KeysDir,        // Where key files are stored.
     LoadDir,        // Where cheat/mod files are stored.
     LogDir,         // Where log files are stored.
+    LosslessDir,    // Where the user-supplied Lossless Scaling library is stored.
     NANDDir,        // Where the emulated NAND is stored.
     PlayTimeDir,    // Where play time data is stored.
     SaveDir,        // Where save data is stored.