Adding InstrumentationLibrary to SDK

[riticksingh]

Adding instrumentation feature to opentelemetry-php to sdk mentioned here: https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/sdk.md#additional-span-interfaces

While working for OTLP/GRPC , it requires Instrumentation library in sdk for dealing with proto files

Something like this : opentelemetry-go reference

[bobstrecansky]

@riticksingh - are you still planning on working on this?

[riticksingh]

I am not getting the exact definition for Instrumentation from specification repo

[bobstrecansky]

Have you asked in the specification gitter channel for more specifics?

[riticksingh]

Yup I asked the in channel of specification but doesn't got any reply

[lalex]

@riticksingh InstrumentationLibrary was added in #101 and then was replaced by ResourceInfo in #133, but the spec has been updated after (open-telemetry/opentelemetry-specification#616).

[riticksingh]

Ok I will go through this

[bobstrecansky]

@riticksingh - what's the status of this?