Replace deprecated pkg_resources with importlib.resources (#1011) #1069

Job	Run time
linux-64-py	6m 8s
random_seed_generation_test	3m 14s
Standard 1-Zone Example (MTC)	56m 16s
prototype_mtc	57m 49s
win-64	9m 12s
Standard 2-Zone Example (SANDAG)	1h 34m 55s
macOS	12m 4s
prototype_marin	1m 50s
prototype_mtc_extended	1h 29m 46s
placeholder_multiple_zone	10m 30s
production_semcog	6m 48s
prototype_sandag_xborder	5m 57s
placeholder_psrc	57m 58s
estimation_edb_creation_test	6m 51s
Estimation Notebooks Test	53m 19s
prototype_mwcog	56m 26s
develop-docbuild	3m 11s
Estimation Mode Unit Tests	23m 37s
Expression Profiling Tests	8m 8s
	9h 23m 59s

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