RFC: avoid pyplot interface in lib #1730

Job	Run time
Image tests	21s
type-checking (3.9)	29s
type-checking (3.10)	31s
type-checking (3.11)	35s
tests (ubuntu-latest, 3.9, bin)	58s
tests (ubuntu-latest, 3.10, bin)	1m 1s
type-checking (3.12)	37s
tests (ubuntu-latest, 3.11, bin)	1m 4s
type-checking (3.13)	53s
tests (ubuntu-latest, 3.12, bin)	1m 16s
tests (ubuntu-latest, 3.13, bin)	1m 31s
tests (ubuntu-20.04, 3.9, bin, minimal, --resolution=lowest-direct)	1m 13s
tests (macos-latest, 3.13, bin)	56s
tests (windows-latest, 3.13, Scripts)	2m 5s
docs	14s
Combine coverage reports	9s
	13m 53s

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