Remove `trajan` as core dependency #491

Job	Run time
mypy	3m 53s
py3.13 \| macos \| unit tests	9m 9s
py3.13 \| macos \| integration tests	12m 21s
py3.13 \| ubuntu \| unit tests	13m 34s
py3.13 \| ubuntu \| integration tests	17m 43s
py3.13 \| windows \| unit tests	19m 57s
py3.13 \| windows \| integration tests	31m 9s
py3.10 \| ubuntu \| unit tests	14m 11s
py3.10 \| ubuntu \| integration tests	17m 7s
py3.11 \| ubuntu \| unit tests	13m 31s
py3.12 \| ubuntu \| unit tests	14m 7s
merge-test-artifacts	2s
	2h 46m 44s

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