Add new option for packing.solvate #1021

Job	Run time
Bleeding Edge mosdef Tests for mBuild	7m 39s
mBuild Tests (macOS-latest, 3.9)	15m 59s
mBuild Tests (macOS-latest, 3.10)	24m 28s
mBuild Tests (macOS-latest, 3.11)	25m 1s
mBuild Tests (ubuntu-latest, 3.9)	11m 45s
mBuild Tests (ubuntu-latest, 3.10)	13m 44s
mBuild Tests (ubuntu-latest, 3.11)	12m 42s
mBuild Tests (windows-latest, 3.9)	20m 33s
mBuild Tests (windows-latest, 3.10)	24m 48s
mBuild Tests (windows-latest, 3.11)	17m 10s
Build Docker Image	0s
	2h 53m 49s

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