feat: Dedicated Server support

[bitsandfoxes]

Resolves #1467, #1462

Versions newer than 2021.3 have additional enums covering the dedicated server runtimes. These are basically just headless builts with assets stripped.

I moved the Runtime Platform check into UnityInfo that we compile with the actual game to have access to the precompile directives.

The only actual difference is on macOS where building a dedicated macOS server does not generate an .app. The Cocoa Native Bridge now does an additional lookup when trying to load the dylib.

App:

├── Frameworks
│   ├── GameAssembly.dylib
│   └── UnityPlayer.dylib
├── Info.plist
├── MacOS
│   └── unity-of-bugs
├── PlugIns
│   └── Sentry.dylib
├── Resources
│   ├── Data
│   │   └── Resources
└── _CodeSignature

Server:

├── Data
│   └── Resources
├── GameAssembly.dylib
├── PlugIns
│   └── Sentry.dylib
├── UnityPlayer.dylib
└── unity-of-bugs

and loading fails with Sentry (bridge): Couldn't load Sentry.dylib - dlopen() failed

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