Customer can add headers to any operation call

[kggilmer]

Support ability for customers to add headers to requests. See here for an example of a service that provides functionality via custom (unmodeled) headers: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Embedded_Metric_Format_Generation_PutLogEvents.html

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[aajtodd]

closing as dup of smithy-lang/smithy-kotlin#122

[github-actions]

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