Rule blocked: CORERULES-1636

- Attach test dataset files that can be used to test the new feature
- Replace the "###" in the issue title with the primary JIRA ticket number for the rule.
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**Links to related JIRA Tickets**
/https://jira.cdisc.org/browse/CORERULES-1636

**Rule Information**
- **Standard**: ADaM
- **Rule ID**: Check number 5
- **Rule Description**: For character flags with variable names that end in FL (a suffix of FL) and that are not population flags has a value that is not Y, N or null

**Describe the problem**
Cannot parse metadata of all variables in a dataset for specific substring matches

**Describe the solution**
Ability to scan all variable names (i.e search all metadata variable_names for specific substrings: suffixes, prefixes and embedded strings. Once identified allow record level values of variables to be checked?

**Proposed rule logic**
```yaml
-name: variable_name *operating at metadata eval to select variables that meet criteria
operator: starts_with|end_with|contains
value : "FL"
-operator: not_contain
value : ('Y' , 'N')
-name: variable_name
operator: not_empty

Note operators starts_with/end_with already exist for record level operations, need to apply at metdata level.

```

**Screenshots**
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