Reload crash on Linux

[gaborcsardi]

> pkgload::load_all()
ℹ Loading otelsdk
> pkgload::load_all()
ℹ Loading otelsdk
[libprotobuf ERROR google/protobuf/descriptor_database.cc:642] File already exists in database: opentelemetry/proto/common/v1/common.proto
[libprotobuf FATAL google/protobuf/descriptor.cc:1988] CHECK failed: GeneratedDatabase()->Add(encoded_file_descriptor, size): 
terminate called after throwing an instance of 'google::protobuf::FatalException'
  what():  CHECK failed: GeneratedDatabase()->Add(encoded_file_descriptor, size): 
Aborted

Possibly we need to run some cleanup function on unload.