* Update datadog/dogstatsd to use otel v0.6.0.
Moving forward with a newer version of datadog-go requires
a PR to be merged that will enforce 8-byte aligned atomics
for 386 (32 bit) architectures. (This guarantee was removed in
datadog-go v3.6.0)
See https://github.com/DataDog/datadog-go/pull/152
* Update all to go.opentelemetry.io/otel v0.6.0
* fixup! Update datadog/dogstatsd to use otel v0.6.0.
* Add the toplevel module
So the go tooling stops throwing weird errors. Without that, running
make fails with the following message:
```
PATH="/…/.tools:${PATH}" go generate ./...
can't load package: package ./exporters/metric/dogstatsd: code in
directory /…/exporters/metric/dogstatsd expects import
"github.com/open-telemetry/opentelemetry-go-contrib/exporters/metric/dogstatsd"
can't load package: package ./plugins/sample/trace: code in directory
/…/plugins/sample/trace expects import
"github.com/open-telemetry/opentelemetry-go-contrib/plugins/sample/trace"
make: *** [Makefile:113: generate] Error 1
```
* Rename the module to use the vanity URL
The `go.opentelemetry.io/contrib` vanity URL is working now, so let's
officially switch to it.
ET