* Use template retry pkg in otlpconfig
* Template out all otlptrace internal
* Add envconfig pkg to otlptrace/internal
* Generate otlptrace/internal/otlpconfig
* Revert templatizing otlptracegrpc
* Add changes to changelog
* Add partialsuccess to internal shared
* Use gotmpl to generate otlptracegrpc/internal
* Add changes to changelog