Replace deprecated pkg_resources with importlib.resources #1068

Job	Run time
linux-64-py	5m 49s
macOS	5m 35s
win-64	9m 21s
Standard 1-Zone Example (MTC)	53m 0s
Standard 2-Zone Example (SANDAG)	1h 38m 51s
prototype_mtc	57m 46s
random_seed_generation_test	3m 26s
prototype_mtc_extended	1h 28m 10s
production_semcog	6m 33s
prototype_marin	1m 50s
placeholder_psrc	53m 56s
Estimation Notebooks Test	51m 13s
prototype_sandag_xborder	5m 41s
prototype_mwcog	57m 52s
placeholder_multiple_zone	10m 13s
Expression Profiling Tests	7m 31s
estimation_edb_creation_test	7m 13s
Estimation Mode Unit Tests	24m 7s
develop-docbuild	0s
	9h 8m 7s

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