Add `image_math` tool #269

Job	Run time
Setup cache and determine changed repositories (3.11)	55s
Check file sizes	3s
Lint tool-list (3.11)	26s
Lint Python scripts (3.11)	13s
Lint R scripts (ubuntu-20.04, release)	1m 44s
Test tools (0, 3.11)	7m 45s
Combine chunked test results (3.11)	45s
Check workflow success	1s
Deploy	0s
Report deploy status	0s
	11m 52s

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