Remove `trajan` as core dependency #480

Job	Run time
py3.13 \| macos \| unit tests	2m 12s
mypy	1m 59s
py3.13 \| ubuntu \| unit tests	1m 56s
py3.13 \| macos \| integration tests	2m 5s
py3.13 \| windows \| unit tests	1m 57s
py3.13 \| ubuntu \| integration tests	1m 59s
py3.10 \| ubuntu \| unit tests	2m 12s
py3.13 \| windows \| integration tests	1m 55s
py3.11 \| ubuntu \| unit tests	1m 58s
py3.10 \| ubuntu \| integration tests	1m 58s
py3.12 \| ubuntu \| unit tests	1m 55s
merge-test-artifacts	1s
	22m 7s

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