IHasTags and IHasExtra replaced with ITagsAndData

[jamescrosswell]

IHasTags and IHasExtra can be merged as anything that implements one also implements the other.
SDK users should use ITagsAndData instead.

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[bitsandfoxes]

That one seems a bit odd with those two small and distinct things now bundled up in one interface.
The interfaces get used in IEventLike and ISpanData but actually accessed very differently. I.e.ISpanData does not get passed through the Enricher to have the defaults set but has them there to be accessed by users.
Instead of merging them, can we get rid of them?

[jamescrosswell]

@bitsandfoxes yes, putting an And in the name of any class/interface is a bit of a smell... it usually indicates you have two unrealted things. I think in this case, we probably need to think about why these things might be sitting together on the same interface and what the name for that "single" purpose is. I opened a related issue: #2676 but maybe we think about renaming these immediately (before merging this pull request). Essentially I'm suggesting a better name for ITagsAndData might be IScopeData... but that depends whether I'm on the same wavelength as everyone else wrt IEventLike and how the shift from Transactions to Spans will play out.

[bruno-garcia]

doesn't seem worth the change but seems like you and Stefan also got to that conclusion