Consider moving setSpan()/getSpan() to its related subsection

[carlosalberto]

That is, that it is accessed through opentelemetry.trace instead of opentelemetry - which is followed by other SIGs, as the idea is overall having each concern have exclusive logical access to its own key/slot. Likewise for the Baggage portion.

Not a strong feeling though, as things are slightly differently organized for JS. For your consideration.

[dyladan]

This was done in order to be friendlier to automatic minifiers (important for browser uses). trace.getSpan can only be minified to a.getSpan where getSpan can be minified to a single letter function.

[vmarchaud]

We discussed this at SIG and we decided that the understability outweight the minification issue, i'll update all the top level helpers to be on each API namespace