Add Resource to SpanData and allow to create Resource using pure API about opentelemetry-dotnet HOT 7 CLOSED

Resource is now in specs: https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/resources-api.md and https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/tracing-api.md#constructing-spandata

Need to move abstract class to API, get rid of interface and add Resource to the SpanData.

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@trwegner do you want to take it?

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Sure! I'll start this afternoon.

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@SergeyKanzhelev and @lmolkova - to move Resource abstract class requires also moving Tag, TagKey and TagValue. Any objection to removing the corresponding Tag* interfaces along the the Resource one?

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yep. This is fine: https://github.com/open-telemetry/opentelemetry-java/blob/4172855fcdefc5d11cf52a974aeaf8de572c9f96/api/src/main/java/io/opentelemetry/tags/Tag.java#L30

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Great! Thanks Sergey.

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Closed via #97

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