Prepare for Vulkan backend (#6595)

* externals: Add libraries required for vulkan

* build: Add support for downloading bundled MoltenVK.

* ci: Install tools needed for Vulkan.

* citra_qt: Add API status indicator

---------

Co-authored-by: GPUCode <geoster3d@gmail.com>

.github/workflows/ci.yml

@@ -150,6 +150,14 @@ jobs:
         shell: bash
       - name: Set up MSVC
         uses: ilammy/msvc-dev-cmd@v1
+      - name: Setup Vulkan SDK
+        uses: humbletim/setup-vulkan-sdk@v1.2.0
+        with:
+          vulkan-query-version: latest
+          vulkan-components: Glslang
+          vulkan-use-cache: true
+      - name: Test glslangValidator
+        run: glslangValidator --version
       - name: Build
         run: ./.ci/windows-msvc/build.sh
         shell: bash
@@ -186,8 +194,9 @@ jobs:
           echo $GIT_TAG_NAME
       - name: Deps
         run: |
-          sudo apt-get update
-          sudo apt-get install ccache apksigner -y
+          sudo add-apt-repository -y ppa:theofficialgman/gpu-tools
+          sudo apt-get update -y
+          sudo apt-get install ccache glslang-dev glslang-tools apksigner -y
       - name: Build
         run: ./.ci/android/build.sh
       - name: Copy and sign artifacts