Improvements

• [cli] Split invoke request protobufs, as monitors and providers take different arguments.
  #9323

• [providers] - gRPC providers can now support an Attach method for debugging. The engine will attach to providers listed in the PULUMI_DEBUG_PROVIDERS environment variable. This should be of the form "providerName:port,otherProvider:port".
  #8979

Bug Fixes

• [cli/plugin] - Dynamic provider binaries will now be found even if pulumi/bin is not on $PATH.
  #9396

• [sdk/go] - Fail appropriatly for config.Try* and config.Require* where the
  key is present but of the wrong type.
  #9407