feat: Added MetricsTracerFactory for metrics collection and tracing #775
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This PR introduces enhancements to the metrics tracing functionaliy. It includes the implementation of a MetricsTracerFactory that facilitates the creation of MetricsTracer instances, allowing for more structured and efficient metrics collection and tracing.
The primary motivation for these changes is to enhance the Spanner client, while also ensuring that the modifications are generalized for broader implementation across other clients.
These changes are based on similar changes made for Java and Go.