Expression Proposal: `IN` - Checks the existence of element in an Array

[lakhbawa]

Type of Expression: Array Function
Return Type: Boolean
Case Sensitive: Yes

Expression Example:
@in('Ten', array(5, 34, 'Ten')) -> TRUE
@in('ten', array(5, 34, 'Ten') -> FALSE
@in(5, array(5, 34, 'Ten') -> TRUE
@in(5, array('5', 34, 'Ten') -> TRUE
@in('5', array(5, 34, 'Ten') -> TRUE

Common Use Case:
This expression can be used to find the existence of specific words/characters in a given array of possible options