Preserve logger context across flushes

[jaredcnance]

Closes #11

[hussam789]

PR Code Suggestions ✨

Category	Suggestion	Impact
General	Initialize empty metrics dictionary The method doesn't copy metrics as mentioned in the docstring "Creates a deep copy of the context excluding metrics", but there's no explicit code to ensure metrics are excluded. Add code to initialize an empty metrics dictionary in the new context. aws_embedded_metrics/logger/metrics_context.py [138-141] new_dimensions: List[Dict] = [] new_default_dimensions: Dict = {} new_default_dimensions.update(self.default_dimensions) +# Ensure metrics are not copied as per method docstring +new_metrics: Dict = {} + Apply this suggestion Suggestion importance[1-10]: 7 __ Why: The suggestion correctly identifies that the method's docstring promises to exclude metrics and that tests expect an empty metrics collection; however, the proposed change only adds an isolated initialization without showing its integration into the new context construction, so its impact on overall functionality is moderate.	Medium
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