feat (enumProperty): new decorator

[43081j]

The enumProperty decorator can be used as a drop-in replacement for the built-in property decorator but with an enum constraint enforced.

For example:

@enumProperty({
  values: ['a', 'b']
})
public value?: string;

In this example, value can only be set to a or b and will be reset to undefined otherwise.

[coveralls]

Pull Request Test Coverage Report for Build 5126508559

• 63 of 63 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.009%) to 98.246%

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Totals
Change from base Build 4693442025:	0.009%
Covered Lines:	2163
Relevant Lines:	2184

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💛 - Coveralls