stats: Track all loan transitions #1287

Job	Run time
Tests (ill, 3.9, pypi, postgresql14, opensearch2)	3m 56s
Tests (acquisition, 3.9, pypi, postgresql14, opensearch2)	2m 31s
Tests (ils, 3.9, pypi, postgresql14, opensearch2)	16m 38s
Tests (document_requests, 3.9, pypi, postgresql14, opensearch2)	3m 33s
Tests (circulation, 3.9, pypi, postgresql14, opensearch2)	8m 42s
	35m 20s

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