* Replace use of old term label with attribute
The specification has unified on the term attribute to describe
key-value pairs. There exist still many hold-overs of the use of the
term label. This updates those uses or deprecates exported types and
functions in favor of renamed forms.
* fix infinite recursion
* Remove backticks from attribute set docs
* Remove LabelFilterSelector entirely
* Remove Metadata.Labels instead of deprecate
* Update changelog with public changes
* Revert OC err msg
* No wrap RELEASING Semantic Convention Generation section
* Initial generator
* Update template render
* Add exception and schema templates
* Add semconv/internal http unification
* Add http template
* Add licenses header
* Embed the templates
* Update static version in schema tmpl
* Add semconv-generate target to Makefile
Use this target to generate versions of the semconv packages.
* Generate semconv packages
* Update RELEASING to use make semconv-generate
* Add comments to semconvkit
* Make SemVer a method instead of a field
* Remove semconv/v* from codecov
* Fix lint for semconvkit main.go
* Fix documentation of validateHTTPStatusCode
Co-authored-by: Chester Cheung <cheung.zhy.csu@gmail.com>