Implement Serializable interface in BucketPerformance

[odashi]

Overview

This change introduces Serializable interface to BucketPerformance and removes from_dict functionality.

Details

BucketPerformance now has only Serializable data and can also implement Serializable for itself. This change involves following implementations:

• Serializable interface of BucketPerformance with fine-grained type checking.
• Add MetricResult.__eq__ to make BucketPerformance comparable.

References

• 446

Blocked by

• 539