Count the number of elements in a Set<String> that match a specific pattern. The pattern is a string that can be found at the beginning, end, or within the elements.
Examples:
Input:
set = {"ApexClass", "ApexTrigger", "CustomObject", "ApexPage"}
pattern = "Apex"
Output: 3
Explanation: "ApexClass", "ApexTrigger", and "ApexPage" all contain "Apex"
Input:
set = {"Contact", "Account", "Opportunity", "Lead"}
pattern = "t"
Output: 2
Explanation: "Contact" and "Opportunity" both contain the letter "t"
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