feature(discretization): add get_polyverts routine to DIS/DISV #1341

Job	Run time
Check format	1m 24s
Build	2m 25s
Smoke test	4m 58s
Parallel testing (ubuntu-22.04)	20m 18s
Test gnu fortran (ubuntu-22.04)	23m 28s
Test intel fortran (ubuntu-22.04, intel-classic, 2021.7)	24m 33s
Parallel testing (macos-12)	34m 28s
Test gnu fortran (macos-12)	32m 48s
Test intel fortran (macos-12, intel-classic, 2021.7)	38m 23s
Test gnu fortran (windows-2022)	36m 39s
Test intel fortran (windows-2022, intel-classic, 2021.7)	36m 56s
	4h 16m 20s

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