Add `BTEvaluateExpression` #230

Job	Run time
cache-env	1s
🧪 Unit tests	3m 19s
🍎 macOS / Editor (x86_64, release)	6m 45s
🐧 Linux / Editor (x86_64, release)	15m 28s
🪟 Windows / Editor (x86_64, release)	7m 52s
🐧 Linux / Template (x86_64, release)	10m 18s
🔌 GDExtension / 🐧 Linux (x86_64, release)	52s
🪟 Windows / Editor .NET (x86_64, release)	10m 48s
🍎 macOS / Editor (arm64, release)	5m 44s
🔌 GDExtension / 🐧 Linux (x86_64, debug)	52s
🔌 GDExtension / 🪟 Windows (x86_64, release)	2m 6s
🔌 GDExtension / 🪟 Windows (x86_64, debug)	2m 7s
🔌 GDExtension / 🍎 macOS (universal, release)	2m 2s
🔌 GDExtension / 🍎 macOS (universal, debug)	1m 39s
🔌 GDExtension / 🌐 Web (wasm32, release)	1m 4s
🍎 macOS / Make macOS Bundles	1m 22s
	1h 12m 19s

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