meta: extract from internal

[mmcloughlin]

We intend to expose package metadata through the code generation interface
#94. If so, it seems wrong to publically expose an internal package. Instead
of duplicating data we'll just make it public instead.

[codecov-commenter]

Codecov Report

Merging #125 (06474fb) into master (71dd798) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #125   +/-   ##
=======================================
  Coverage   73.05%   73.05%           
=======================================
  Files          30       30           
  Lines        1874     1874           
=======================================
  Hits         1369     1369           
  Misses        445      445           
  Partials       60       60           

Flag	Coverage Δ
unittests	73.05% <ø> (ø)

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Impacted Files	Coverage Δ
meta/cite.go	0.00% <ø> (ø)
meta/meta.go	16.66% <ø> (ø)

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