fix(Expression): remove use of Object.values() and String.prototype.includes()

[Feeni]

These methods are not supported in IE11. As a result, any RSQL coming from IE11 will throw an error.

The original functionality will work the same as before.

Documentation Object.values() String.prototype.includes()

[coveralls]

Pull Request Test Coverage Report for Build 38

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 35:	0.0%
Covered Lines:	272
Relevant Lines:	272

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💛 - Coveralls

[tylerhubert]

:tada: This PR is included in version 2.1.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: