* Move the semantic conventions generated code into its own module
* remove un-needed dependencies
* move the semconv module to the top level, out of the API namespace
* Update README.md
Co-authored-by: Anuraag Agrawal <anuraaga@gmail.com>
* move SemanticAttributes to a more appropriate package and deprecate the old ones in the api package.
* Apply suggestions from code review
Co-authored-by: Anuraag Agrawal <anuraaga@gmail.com>