ENH: Add Python example for SmoothImageWithDiscreteGaussianFilter #909

Job	Run time
build-test-notebooks (ubuntu-24.04)	2m 25s
build-test-python-superbuild (macos-15)	25m 52s
build-test-documentation (ubuntu-24.04)	46m 50s
build-test-python-superbuild (ubuntu-24.04)	26m 1s
build-test-notebooks (windows-2022)	3m 50s
build-test-python-superbuild (windows-2022)	24m 36s
build-test-cxx (ubuntu-24.04)	19m 20s
build-test-cxx (macos-14)	15m 26s
build-test-cxx (windows-2022)	20m 5s
build-test-notebooks (macos-14)	6h 0m 16s
	9h 4m 41s

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