Merge two maps of String to Integer. If a key exists in both maps, sum their values. Return the merged map.

Examples:

Input: map1 = {a: 1, b: 2}, map2 = {b: 3, c: 4} Output: {a: 1, b: 5, c: 4} Explanation: Key b exists in both, so values are summed (2 + 3 = 5) Input: map1 = {x: 10}, map2 = {y: 20} Output: {x: 10, y: 20} Explanation: No common keys, simple merge Input: map1 = {}, map2 = {a: 1} Output: {a: 1} Explanation: One map is empty, return the non-empty map
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