Expose errors to public clients

[yunapotamus]

• Create a common defined set of errors to surface to clients.
  • Errors with definition of ClientConfig or ModuleConfig are surfaced to clients at MetricsLoggerService initialization.
  • Errors that occur at runtime (proto serialization, networking errors) are propagated to error handlers as-is.
• Use OperationManager as a layer of indirection for log message/error reporting.
  • Refactor Xray and MetricsLogger to use this indirection.
• Add tests for OperationManager and Xray.