feat!: remove old postprocessing and polars entirely (#84) #75

Job	Run time
lint-and-test / Test Suite	10m 42s
lint-and-test / Check Package	4m 0s
lint-and-test / Format	18s
lint-and-test / Clippy	4m 34s
lint-and-test / Unused Dependencies	6m 46s
Release	1m 43s
	28m 3s

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