Add library resources to named meters in the SDK

[arminru]

Part of / follow-up for #588:

The implementation of MeterSdkFactory added in #668 currently discards the passed instrumentation name and version. As specified in the OTEP, it has to be made available as a Resource (in case of Java we use a dedicated info object InstrumentationLibraryInfo, see #632).
The metrics API currently has changes pending, this will have to be addressed once the SDK spec for metrics is updated.

(analogous to #617 for named tracers)

[bogdandrutu]

@arminru I think all the libraries should use a different object and not resource.

[arminru]

@arminru I think all the libraries should use a different object and not resource.

@bogdandrutu The OTEP mentions that a Resource has to be used but the spec doesn't impose any limitations so I'm fine with keeping the InstrumentationLibraryInfo.

[jkwatson]

I believe this is done. closing. Please reopen if something else is needed.