fix: Rely on equal for computing contains

[santialbo]

This change allows the contains to be computed using the toValue of the items in the array.

Before this change if I had an array of "Drop" contains would not match against the value.

this is not valid liquid, this is just to explain the case i'm trying to fix

{{[Drop("hello"), Drop("bye")] | contains "hello"}} -> false

with the changes on this pr, it will return true.

[github-actions[bot]]

:tada: This PR is included in version 10.10.1 :tada:

The release is available on:

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

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