Add viewport downsample algorithm #2133

Job	Run time
Run pre-commit	17s
Setup workflow	2s
Core tests on Python 3.12, ubuntu-latest	4m 39s
UI tests on Python 3.9, ubuntu-latest	4m 11s
Unit tests on Python 3.9, ubuntu-latest	27m 42s
Unit tests on Python 3.11, ubuntu-latest	27m 33s
Unit tests on Python 3.9, macos-latest	37m 8s
Unit tests on Python 3.11, macos-latest	44m 33s
Unit tests on Python 3.9, windows-latest	43m 58s
Unit tests on Python 3.11, windows-latest	46m 58s
Unit tests on Python 3.10, ubuntu-latest	27m 19s
	4h 24m 20s

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