* Update README
Move project status to top of project documentation and add explicit
warnings that this project may introduce breaking changes.
* Add disclaimer to public packages docs
* Use explicit warning in README
* Update codes to match specification
* Add changes to changelog
* go mod tidy
* Add unit tests for codes
* Update SetStatus methods to only filter Unset
* Update apitest code being tested
* Add otel/codes package to replace google.golang.org/grpc/codes
* Replace google.golang.org/grpc/codes with otel/codes
* Update opentracing bridge to use OTel codes
* Update semconv to use OTel codes
* Update SDK to convert from OTel codes to gRPC
* go mod tidy
* Add change to CHANGELOG
* Fix word from feedback
* Move content length out of basic attributes
semconv.httpBasicAttributesFromHTTPRequest() was including the request's content length,
which is a high-cardinality label. It ended up in metric labels through the use of that function
by semconv.HTTPServerMetricAttributesFromHTTPRequest().
* Add CHANGELOG entry
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>