refactor: replace LineOrPoint struct with enum #2737

Job	Run time
bench	1m 21s
geo-fuzz (georust/geo-ci:proj-9.2.1-rust-1.70)	1m 6s
geo (georust/geo-ci:proj-9.2.1-rust-1.63)	1m 1s
geo (georust/geo-ci:proj-9.2.1-rust-1.69)	1m 1s
geo (georust/geo-ci:proj-9.2.1-rust-1.70)	57s
geo-postgis (georust/geo-ci:proj-9.2.1-rust-1.63)	3m 18s
geo-postgis (georust/geo-ci:proj-9.2.1-rust-1.69)	2m 26s
geo-postgis (georust/geo-ci:proj-9.2.1-rust-1.70)	59s
geo-types (georust/geo-ci:proj-9.2.1-rust-1.63)	3m 32s
geo-types (georust/geo-ci:proj-9.2.1-rust-1.69)	3m 19s
geo-types (georust/geo-ci:proj-9.2.1-rust-1.70)	1m 32s
lint (georust/geo-ci:proj-9.2.1-rust-1.70)	1m 49s
ci result	0s
	22m 21s

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