stats: Track all loan transitions #1294

Job	Run time
Tests (circulation, 3.9, pypi, postgresql14, opensearch2)	9m 29s
Tests (acquisition, 3.9, pypi, postgresql14, opensearch2)	2m 32s
Tests (ils, 3.9, pypi, postgresql14, opensearch2)	16m 23s
Tests (ill, 3.9, pypi, postgresql14, opensearch2)	3m 32s
Tests (document_requests, 3.9, pypi, postgresql14, opensearch2)	3m 8s
	35m 4s

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