Add feature maps (fmaps) mode for sliding-kernel feature extraction #1014

Job	Run time
Build prereqs (macos-15-intel)	17s
Build prereqs (ubuntu-22.04-arm)	11s
Build prereqs (windows-latest)	13s
Build prereqs (macos-14)	13s
Build prereqs (ubuntu-22.04)	12s
Build wheels (ubuntu-22.04-arm / cp310)	11m 16s
Build wheels (ubuntu-22.04-arm / cp312)	5m 53s
Build wheels (ubuntu-22.04-arm / cp311)	6m 3s
Build wheels (ubuntu-22.04-arm / cp313)	7m 41s
Build wheels (ubuntu-22.04 / cp311)	5m 9s
Build wheels (ubuntu-22.04 / cp313)	5m 15s
Build wheels (ubuntu-22.04 / cp312)	5m 54s
Build wheels (ubuntu-22.04 / cp310)	5m 53s
Build wheels (windows-latest / cp312)	59s
Build wheels (windows-latest / cp310)	1m 52s
Build wheels (windows-latest / cp311)	1m 7s
Build wheels (windows-latest / cp313)	1m 2s
Build wheels (macos-14 / cp310)	56s
Build wheels (macos-14 / cp311)	27s
Build wheels (macos-14 / cp313)	40s
Build wheels (macos-14 / cp312)	35s
Build wheels (macos-15-intel / cp311)	53s
Build wheels (macos-15-intel / cp310)	1m 35s
Build wheels (macos-15-intel / cp312)	49s
Build wheels (macos-15-intel / cp313)	1m 18s
	1h 6m 23s

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