WIP: Implementing RStruct methods for `StableApiDefinition` in order to support TruffleRuby #1752

Job	Run time
🔘 Static (3.2.2, ubuntu-latest, stable)	1m 11s
📥 Fetch CI data	1s
🧪 Test (2.7, ubuntu-latest, 1.65)	4m 33s
🧪 Test (2.7, ubuntu-latest, stable)	2m 52s
🧪 Test (2.7, windows-2022, stable)	4m 58s
🧪 Test (3.0, ubuntu-latest, 1.65)	4m 10s
🧪 Test (3.0, ubuntu-latest, stable)	2m 29s
🧪 Test (3.0, macos-latest, stable)	1m 52s
🧪 Test (3.0, windows-2022, stable)	4m 55s
🧪 Test (3.1, ubuntu-latest, 1.65)	4m 20s
🧪 Test (3.1, ubuntu-latest, stable)	2m 39s
🧪 Test (3.1, windows-2022, stable)	4m 53s
🧪 Test (3.2, ubuntu-latest, 1.65)	4m 31s
🧪 Test (3.2, ubuntu-latest, stable)	2m 21s
🧪 Test (3.2, macos-latest, stable)	1m 48s
🧪 Test (3.2, windows-2022, stable)	4m 54s
🧪 Test (3.3, ubuntu-latest, 1.65)	4m 17s
🧪 Test (3.3, ubuntu-latest, stable)	2m 39s
🧪 Test (3.3, macos-latest, stable)	1m 54s
🧪 Test (3.3, windows-2022, stable)	4m 49s
🧪 Test (3.4.0-preview2, ubuntu-latest, 1.65)	3m 29s
🧪 Test (3.4.0-preview2, ubuntu-latest, stable)	1m 53s
🧪 Test (3.4.0-preview2, macos-latest, stable)	7m 21s
🧪 Test (truffleruby, ubuntu-latest, stable)	2m 14s
🧪 Test (truffleruby, macos-latest, stable)	1m 40s
🧪 Test (ruby-debug, ubuntu-24.04, stable)	2m 12s
🧪 Test (mswin, windows-2022, stable-x86_64-pc-windows-msvc)	4m 54s
	1h 29m 49s

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