RFC: avoid the use of matplotlib.pyplot as much as possible #1748

Job	Run time
type-checking (3.9)	30s
type-checking (3.10)	34s
Image tests	24s
type-checking (3.11)	28s
tests (ubuntu-latest, 3.9, bin)	1m 1s
type-checking (3.12)	32s
tests (ubuntu-latest, 3.10, bin)	59s
type-checking (3.13)	40s
tests (ubuntu-latest, 3.11, bin)	52s
tests (ubuntu-latest, 3.12, bin)	1m 16s
tests (ubuntu-latest, 3.13, bin)	1m 35s
tests (ubuntu-20.04, 3.9, bin, minimal, --resolution=lowest-direct)	1m 12s
tests (macos-latest, 3.13, bin)	52s
tests (windows-latest, 3.13, Scripts)	2m 23s
docs	10s
Combine coverage reports	10s
	13m 38s

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