Replace deprecated pkg_resources with importlib.resources #1066

Job	Run time
linux-64-py	5m 51s
macOS	5m 4s
win-64	9m 4s
Standard 1-Zone Example (MTC)	49m 33s
placeholder_psrc	55m 43s
prototype_mtc	54m 0s
Standard 2-Zone Example (SANDAG)	1h 33m 26s
prototype_marin	1m 49s
prototype_mtc_extended	1h 31m 56s
prototype_mwcog	56m 58s
prototype_sandag_xborder	6m 1s
placeholder_multiple_zone	10m 34s
Estimation Mode Unit Tests	24m 10s
estimation_edb_creation_test	7m 26s
random_seed_generation_test	3m 29s
production_semcog	6m 45s
Estimation Notebooks Test	51m 54s
Expression Profiling Tests	7m 56s
develop-docbuild	0s
	9h 1m 39s

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