aoc2024: Implement day9 solution

part2 is kinda unoptimized, it should not use expanded input, but I did
not feel like rewriting my parsing code :)

userspace/aoc2024/day9/CMakeLists.txt

@@ -0,0 +1,9 @@
+set(SOURCES
+	main.cpp
+)
+
+add_executable(aoc2024_day9 ${SOURCES})
+banan_include_headers(aoc2024_day9 ban)
+banan_link_library(aoc2024_day9 libc)
+
+install(TARGETS aoc2024_day9 OPTIONAL)