fix(windows): support for custom Package.appxmanifest

[tido64]

Description

Picks up the Package.appxmanifest placed next to the generated .sln.

Resolves #224.

Platforms affected

• Android
• iOS
• macOS
• Windows

Test plan

1. Generate the solution:

   cd example
   yarn
   yarn install-windows-test-app
   start windows/Example.sln
   

2. Observe that Package.appxmanifest is the same as the one from react-native-test-app.
3. Close Visual Studio.
4. Copy /windows/ReactTestApp/Package.appxmanifest ito /example/windows
5. Modify /example/windows/Package.appxmanifest, e.g. change the display name to Example
6. Open app.json and add the following:

   diff --git a/example/app.json b/example/app.json
   index 8463354..941fa30 100644
   --- a/example/app.json
   +++ b/example/app.json
   @@ -29,5 +29,8 @@
          "dist/assets",
          "dist/main.windows.bundle"
        ]
   +  },
   +  "windows": {
   +    "appxManifest": "windows/Package.appxmanifest"
      }
    }

7. Regenerate the solution: yarn install-windows-test-app
8. Open the new Visual Studio solution
9. Observe that the display name is now Example

Docs have been updated to include the new property: https://github.com/microsoft/react-native-test-app/wiki/Manifest-(app.json)#appxmanifest

[kelset]

[github-actions]

🎉 This PR is included in version 0.5.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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