Create a method that takes a Map<String, Integer> and returns the sum of all values in the map. This is a fundamental operation when aggregating data from maps, commonly used in reporting scenarios.
In Salesforce, this pattern appears frequently when you need to calculate totals from grouped data, such as counting records by category, summing points by user, or aggregating revenue by region.
Examples:
Input: valueMap = {'Sales' => 100, 'Marketing' => 200, 'Engineering' => 150}
Output: 450
Explanation: Sum of 100 + 200 + 150 equals 450
Input: valueMap = {'Product' => 500}
Output: 500
Explanation: Single entry map returns that value
Input: valueMap = {}
Output: 0
Explanation: Empty map returns 0
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