Minor GPKG/SQLite Reorganization #1648

Job	Run time
test_pet (ubuntu-latest)	3m 19s
test_pet (macos-latest)	3m 55s
test_unit (ubuntu-latest)	4m 37s
test_unit (macos-latest)	6m 42s
test_bmi_c (ubuntu-latest)	5m 42s
test_bmi_c (macos-latest)	6m 47s
test_bmi_fortran (ubuntu-latest)	5m 1s
test_bmi_cpp (ubuntu-latest)	2m 48s
test_bmi_fortran (macos-latest)	5m 33s
test_bmi_cpp (macos-latest)	4m 56s
test_bmi_python (ubuntu-latest)	4m 0s
test_mpi_remote_nexus (ubuntu-latest)	1m 43s
test_bmi_python (macos-latest)	5m 56s
test_bmi_multi (ubuntu-latest)	5m 11s
test_bmi_multi (macos-latest)	7m 27s
	1h 13m 37s

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