Bluetooth Lib: Metrics Logging

This library is meant to provide helper functions for logging in Bluetooth code.

Cobalt logging

Currently, all the helper functions in this library are utility functions for initializing and using Cobalt logger for Bluetooth specific metrics.

Any component that uses "bt-metrics-logging library should have access to the MetricEventLoggerFactory capability. For example:

// Component manifest for a component that uses this library.
{
    ...
    use: [
        ...
        {
            protocol: [ "fuchsia.metrics.MetricEventLoggerFactory" ],
        },
    ],
    ...
}