Parse a simple JSON object string containing only key-value pairs and convert it to an Apex map structure. The values will only be strings, integers, or booleans.
Examples:
Input: jsonString = '{"name":"John","age":30,"isActive":true}'
Output: {'name' => 'John', 'age' => 30, 'isActive' => true}
Input: jsonString = '{"a":1,"b":2,"c":3}'
Output: {'a' => 1, 'b' => 2, 'c' => 3}
Input: jsonString = '{}'
Output: {}
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