pdata/pcommon : export NewSliceFromRaw

[ldb]

Is your feature request related to a problem? Please describe.
Right now, the apparently only way to create slices Values and adding them to a span's attributes is pretty unergonomic:

s := pcommon.NewSlice()
s.EnsureCapacity(1)
v := b.AppendEmpty()
v.SetStringVal("bar")
vs := pcommon.NewValueSlice()
s.CopyTo(vs.SliceVal())
span.Attributes().Insert("foo", vs)

This could be made much easier by exporting pcommon.NewSliceFromRaw() in the same way that pcommon.NewMapFromRaw() is already exported.

Describe the solution you'd like
Export internal.NewSliceFromRaw to make it easier to create slices to be used as attribute values.

[TylerHelmuth]

pinging @dmitryax

[dmitryax]

Makes sense. This is actually something that was missed in #5311.

@ldb do you want to submit a PR?

[TylerHelmuth]

@ldb if you are unavailable I can take it

[ldb]

Hey @dmitryax and @TylerHelmuth, sorry I only now saw the response here. Would've loved to open a PR for this, but now there is no need I see :)
Thanks for fixing this so quickly!

[TylerHelmuth]

@dmitryax This issue can be closed. @ldb Thanks for bringing this up!