refactor(tsp): Elevate APT to generalized transport class #1322

Job	Run time
Check format	1m 45s
Smoke test	3m 59s
Build	1m 34s
Test gnu fortran (ubuntu-22.04)	22m 10s
Test gnu fortran (macos-12)	24m 25s
Parallel testing (ubuntu-22.04)	8m 58s
Test intel fortran (ubuntu-22.04, intel-classic, 2021.7)	22m 55s
Parallel testing (macos-12)	26m 27s
Test gnu fortran (windows-2022)	34m 14s
Test intel fortran (macos-12, intel-classic, 2021.7)	29m 6s
Test intel fortran (windows-2022, intel-classic, 2021.7)	32m 0s
	3h 27m 33s

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