Replace more IR Scala case classes with Java interfaces #1718

Job	Run time
🔍 Files Changed / Changed Files	5s
🔍 Files Changed / Changed Standard libs API docs files	6s
🏷 Append Standard library API change label	0s
⚙️ Checks (Optional) / Engine (GraalVM CE) (macos, amd64)	1h 16m 54s
⚙️ Checks (Optional) / Standard Library Tests (GraalVM CE) (macos, amd64)	54m 23s
⚙️ Checks (Optional) / JVM Tests (GraalVM CE) (macos, amd64)	1h 5m 4s
⚙️ Checks / Engine (GraalVM CE) (linux, amd64)	53m 10s
⚙️ Checks / Engine (GraalVM CE) (windows, amd64)	52m 41s
⚙️ Checks / JVM Tests (GraalVM CE) (linux, amd64)	32m 49s
⚙️ Checks / JVM Tests (GraalVM CE) (windows, amd64)	46m 53s
⚙️ Checks / Standard Library API check (linux, amd64)	11m 46s
⚙️ Checks / Standard Library Tests (GraalVM CE) (linux, amd64)	45m 26s
⚙️ Checks / Verify License Packages (linux, amd64)	3m 37s
⚙️ Checks / Standard Library Tests (GraalVM CE) (windows, amd64)	42m 17s
Engine Required Checks	1s
	8h 5m 12s

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