Commits on Sep 15, 2020

1. Support custom metadata for schema and columns …

   Closes #13. This PR adds two new functions: `Arrow.getmetadata(x)` and
   `Arrow.setmetadata!(x, ::Dict{String, String})`, which allows, rather
   obviously, setting metadata for an arbitrary object and then retrieving
   that metadata. By utilizing these functions, users can get/set custom
   metadata that is serialized in the arrow format at the schema level and
   field (column) level. More specifically, to set arrow schema custom
   metadata, a user would call `Arrow.setmetadata!(tbl, meta)` on their
   table object `tbl`. To retrive arrow schema custom metadata, one can
   call `tbl = Arrow.Table(...); meta = Arrow.getmetadata(tbl)`. Similarly
   for column/field-level metadata, one can call `Arrow.setmetadata!(col,
   colmeta)` to cause custom metadata to be serialized in the arrow
   message, and call `Arrow.getmetadata(tbl.colX)` to retrive custom
   metadata for a specific column in an `Arrow.Table`.
   
   Note that technically the arrow `Message` and `Footer` objects also
   allow setting custom metadata, but those are not addressed at all in
   this PR since they seem to be less useful/urgent.

   

   quinnj committed Sep 15, 2020
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