Provide a dictionary of `UserLogLevel` at initialization and configuration of the `AWSCloudWatchLoggingPlugin`.


```swift
do {
    let categoryLogLevels: [String: LogLevel] = ["Storage": .verbose, "API": .verbose]
    let userLogLevel = UserLogLevel(defaultLogLevel: .debug, categoryLogLevel: categoryLogLevels)
    let userLogLevels: [String: UserLogLevel] = ["xyz-123": userLogLevel]
    let loggingConstraints = LoggingConstraints(defaultLogLevel: .warn, userLogLevel: userLogLevels)
    let loggingConfiguration = AWSCloudWatchLoggingPluginConfiguration(logGroupName: "<log-group-name>", region: "<region>", loggingConstraints: loggingConstraints)
    let loggingPlugin = AWSCloudWatchLoggingPlugin(loggingPluginConfiguration: loggingConfiguration)
    try Amplify.add(plugin: loggingPlugin)
} catch {
    assert(false, "Error initializing Amplify: \(error)")
}
```