Soft-deprecation of type_sum()

[krlmlr]

type_sum() now forwards to vec_ptype_abbr(), but there are concerns regarding its deprecation:

• Is vec_ptype_abbr() stable (Soft deprecate type_sum once vctrs is on CRAN #134 (comment))? Type descriptions to be shown in a word/sentence/paragraph are supposed to be new generics (Think through type labels vctrs#139 (comment)), forwarding to existing vec_ptype_abbr() functions here.

• type_sum() also works for non-vector types, vec_ptype_abbr() does not. This isn't a huge problem, but still worth mentioning.

@hadley: Do we initiate soft-deprecation now? It seems safe -- it's only a message once per session, and also only for direct callers.

[hadley]

I think we should avoid soft-deprecating now, if we're going to soft-deprecate to something else in the near future.

[krlmlr]

One thing to keep in mind: Some packages might override type_sum() to return a classed object, which affects the display of the type in a pillar. See ?pillar_type_sum.

[krlmlr]

We also should think about obj_sum() and is_vector_s3().

[krlmlr]

Do we move it to vctrs, along with perhaps obj_sum() and a new size_sum() (#173)?

[krlmlr]

Let's keep the status quo for now.

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