Internal: Refactor colorbar to decouple from axis. Introduces UltraColorbar and UltraColorbarLayout #2860

Job	Run time
run-if-changes	6s
select-tests	13s
get-versions	15s
build (3.11, 3.10) / Test Python 3.11 with MPL 3.10	27s
build (3.11, 3.10) / Compare baseline Python 3.11 with MPL 3.10	9m 28s
build (3.11, 3.9) / Compare baseline Python 3.11 with MPL 3.9	9m 20s
build (3.11, 3.9) / Test Python 3.11 with MPL 3.9	27s
build (3.10, 3.10) / Compare baseline Python 3.10 with MPL 3.10	10m 0s
build (3.10, 3.9) / Compare baseline Python 3.10 with MPL 3.9	10m 21s
build (3.10, 3.9) / Test Python 3.10 with MPL 3.9	23s
build (3.10, 3.10) / Test Python 3.10 with MPL 3.10	27s
build (3.12, 3.9) / Compare baseline Python 3.12 with MPL 3.9	9m 19s
build (3.12, 3.9) / Test Python 3.12 with MPL 3.9	26s
build (3.12, 3.10) / Test Python 3.12 with MPL 3.10	25s
build (3.12, 3.10) / Compare baseline Python 3.12 with MPL 3.10	9m 47s
build (3.13, 3.9) / Test Python 3.13 with MPL 3.9	32s
build (3.13, 3.9) / Compare baseline Python 3.13 with MPL 3.9	9m 14s
build (3.13, 3.10) / Test Python 3.13 with MPL 3.10	27s
build (3.13, 3.10) / Compare baseline Python 3.13 with MPL 3.10	9m 26s
build-success	3s
	1h 21m 6s

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