v2.1.1: More logging configuration

What's Changed

• Support more logging configuration by @rgalanakis in #5 and 088b14d

• Add a custom ID provider rather than always using uuid4
• Add a MakeHandler to allow callers to override the
  log handler.
• Add TracingHandler, which provides an easy log handler
  that can log out trace and span ids.
• Allow excluding trace_id from logger attrs,
  for use primarily with TracingHandler
• Allow AfterRequest to return a null logger
  to skip logging.
• The logger passed to the request no longer has
  all the request fields. This is a massive number
  of fields which just spams logs. Instead,
  the trace_id can be used for correllation.

Full Changelog: v2.0.0...v2.1.1