Minor GPKG/SQLite Reorganization #1627

Job	Run time
test_pet (ubuntu-latest)	2m 50s
test_pet (macos-latest)	4m 29s
test_unit (ubuntu-latest)	4m 54s
test_bmi_cpp (ubuntu-latest)	4m 19s
test_unit (macos-latest)	5m 6s
test_mpi_remote_nexus (ubuntu-latest)	1m 49s
test_bmi_cpp (macos-latest)	5m 20s
test_bmi_c (ubuntu-latest)	5m 59s
test_bmi_fortran (ubuntu-latest)	3m 12s
test_bmi_c (macos-latest)	6m 2s
test_bmi_multi (ubuntu-latest)	3m 47s
test_bmi_fortran (macos-latest)	5m 50s
test_bmi_multi (macos-latest)	8m 53s
test_bmi_python (ubuntu-latest)	4m 1s
test_bmi_python (macos-latest)	8m 12s
	1h 14m 43s

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