Add `image_math` tool #268

Job	Run time
Setup cache and determine changed repositories (3.11)	5m 39s
Setup cache and determine changed repositories (3.11)	1m 0s
Lint R scripts (ubuntu-20.04, release)	2m 39s
Lint R scripts (ubuntu-20.04, release)	1m 14s
Lint Python scripts (3.11)	12s
Lint Python scripts (3.11)	14s
Test tools (0, 3.11)	10m 7s
Test tools (0, 3.11)	6m 42s
Check file sizes	4s
Check file sizes	3s
Lint tool-list (3.11)	30s
Lint tool-list (3.11)	28s
Combine chunked test results (3.11)	49s
Combine chunked test results (3.11)	39s
Check workflow success	1s
Check workflow success	1s
Deploy	0s
Deploy	0s
Report deploy status	0s
Report deploy status	0s
	30m 22s

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