feat: add alias for metadata cascade policy create

[mwwoda]

Fixes #458

[coveralls]

Pull Request Test Coverage Report for Build 4314025602

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 86.142%

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Totals
Change from base Build 4312076507:	0.002%
Covered Lines:	3980
Relevant Lines:	4476

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💛 - Coveralls