ENH: retain index of buildings and plots intersecting sightlines #2575

Job	Run time
ubuntu-latest, ci/envs/310-oldest.yaml	3m 29s
ubuntu-latest, ci/envs/310-latest.yaml	3m 12s
ubuntu-latest, ci/envs/311-latest.yaml	3m 46s
ubuntu-latest, ci/envs/312-latest.yaml	4m 4s
ubuntu-latest, ci/envs/312-dev.yaml	3m 18s
macos-13, ci/envs/312-latest.yaml	7m 53s
macos-14, ci/envs/312-latest.yaml	3m 27s
windows-latest, ci/envs/312-latest.yaml	4m 47s
ubuntu-latest, ci/envs/312-min.yaml	2m 55s
	36m 51s

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