refactor: replace LineOrPoint struct with enum #2738

Job	Run time
bench	5m 48s
geo-fuzz (georust/geo-ci:proj-9.2.1-rust-1.70)	1m 23s
geo-postgis (georust/geo-ci:proj-9.2.1-rust-1.63)	2m 35s
geo-postgis (georust/geo-ci:proj-9.2.1-rust-1.69)	2m 50s
geo-postgis (georust/geo-ci:proj-9.2.1-rust-1.70)	58s
geo (georust/geo-ci:proj-9.2.1-rust-1.63)	4m 45s
geo (georust/geo-ci:proj-9.2.1-rust-1.69)	4m 14s
geo (georust/geo-ci:proj-9.2.1-rust-1.70)	2m 29s
geo-types (georust/geo-ci:proj-9.2.1-rust-1.63)	2m 55s
geo-types (georust/geo-ci:proj-9.2.1-rust-1.69)	3m 34s
geo-types (georust/geo-ci:proj-9.2.1-rust-1.70)	1m 10s
lint (georust/geo-ci:proj-9.2.1-rust-1.70)	1m 42s
ci result	1s
	34m 24s

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