feat: Virtual depth API

[Derongan]

[0ffz]

Still relevant today, the code doing this for depth meter is pretty ugly and most of it should be refactored into DeeperWorld, see https://github.com/MineInAbyss/MineInAbyss/blob/53b7e8b408898daa8afeabd1c9f35c58f9e15751/mineinabyss-features/src/main/kotlin/com/mineinabyss/features/tools/depthmeter/DoShowDepth.kt#L71