[OPT-3676] Adjust number and string variable filters to accept null/undefined - camunda JIRA

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It is possible to add null as one of the values for number and string filters for the 'in' and 'not in' cases
variable filter API docs are updated accordingly

Number

{
  "operator" : "in", // in, "not in", <, >, <=, >=
  "values" : [ null, 1234 ] // null only works for in/not in
}

String

{
  "operator" : "in", // in, "not in"
  "values" : [ "String 1", "String 2", null ] // null => null/undefined values
}

is depended on by

OPT-3679 Add the option to select null/undefined for number and string variables