Merge pull request #133 from amzn/smoke-http-3.0.0

Update smoke-http to 3.0.0

Merge pull request #131 from amzn/metadata-provider

Add metadata provider.

Merge pull request #130 from amzn/disable_two_spans

Disable using two spans per operation.

Merge pull request #127 from amzn/report_thrown_error_to_span

Report thrown error to span

Merge pull request #126 from amzn/identifiable_protocol_for_errors

Add and support the Identifiable protocol for errors.

Merge pull request #125 from amzn/disributed_tracing_improvements

Distributed tracing improvements.

Merge pull request #119 from amzn/distributed-tracing

Integrate apple/swift-distributed-tracing.

Limit prettyPrinted JSON to the debug build

Merge pull request #116 from amzn/decorate_logger

Report requestReadLatencyMS and decorate logger with incomingOperation.

Merge pull request #114 from amzn/thread_processing_options

Add option to process requests on the cooperative or custom thread pool