Repackage builtin cores and interfaces into a user repo #255

Job	Run time
Check if changelog was changed	18s
Test typing	2m 56s
Run tests on python 3.9	8m 23s
Generate examples	6m 27s
Run lint checks	1m 44s
Package cores repository	4m 57s
Test package distribution	5m 46s
Run tests on python 3.10	9m 11s
Run tests on python 3.11	4m 53s
Run tests on python 3.12	6m 51s
Run tests on python 3.13	7m 16s
	58m 42s

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