chore(cubesql): Rename SplitRules to OldSplitRules to prepare for mig… #2904

Job	Run time
Check fmt/clippy	1m 53s
Unit (Rewrite Engine)	16m 19s
Unit (Legacy)	7m 10s
Build windows-2019 16.x with Python fallback	17m 54s
Build Linux GNU 16.x x86_64-unknown-linux-gnu with Python 3.9	6m 58s
Build macos-11 x86_64-apple-darwin 16.x with Python fallback	15m 26s
Build Linux GNU 16.x aarch64-unknown-linux-gnu with Python 3.9	6m 56s
Build macos-11 aarch64-apple-darwin 16.x with Python fallback	16m 6s
Build Linux GNU 16.x x86_64-unknown-linux-gnu with Python 3.10	7m 11s
Build Linux GNU 16.x x86_64-unknown-linux-gnu with Python 3.11	7m 1s
Build Linux GNU 16.x x86_64-unknown-linux-gnu with Python 3.12	6m 50s
Build Linux GNU 16.x aarch64-unknown-linux-gnu with Python 3.12	7m 10s
Build Linux GNU 16.x x86_64-unknown-linux-gnu with Python fallback	7m 11s
Build Linux GNU 16.x aarch64-unknown-linux-gnu with Python fallback	7m 0s
Build Linux GNU 18.x x86_64-unknown-linux-gnu with Python 3.9	7m 26s
Build Linux GNU 18.x x86_64-unknown-linux-gnu with Python 3.10	7m 18s
Build Linux GNU 18.x x86_64-unknown-linux-gnu with Python 3.11	7m 19s
Build Linux GNU 18.x x86_64-unknown-linux-gnu with Python 3.12	6m 59s
Build Linux GNU 18.x x86_64-unknown-linux-gnu with Python fallback	7m 17s
	2h 47m 24s

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