ARROW-5109: [Go] implement reading binary/string arrays from Arrow file

[sbinet]

No description provided.

[codecov-io]

Codecov Report

Merging #4155 into master will decrease coverage by 26.97%.
The diff coverage is 0%.

@@ Coverage Diff @@## master #4155 +/- ##
===========================================
- Coverage 87.89% 60.92% -26.98% 
===========================================
Files 758 67 -691 Lines 92163 4862 -87301 Branches 1251 0 -1251 ===========================================
- Hits 81006 2962 -78044 + Misses 11040 1791 -9249 + Partials 117 109 -8

Impacted Files	Coverage Δ
go/arrow/ipc/file_reader.go	0% <0%> (ø)	⬆️
python/pyarrow/ipc.pxi
cpp/src/arrow/csv/chunker-test.cc
cpp/src/parquet/column_page.h
cpp/src/parquet/bloom_filter-test.cc
cpp/src/arrow/array/builder_decimal.cc
cpp/src/plasma/client.cc
cpp/src/arrow/io/test-common.h
cpp/src/arrow/util/int-util-test.cc
cpp/src/arrow/python/io.cc
... and 682 more

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[sbinet]

PTAL @stuartcarnie@alexandreyc@nickpoorman

[alexandreyc]

I still need to fully review ARROW-5108 before doing this one, but I will.

[sbinet]

you mean #4114 ?
oops, already collected it... my bad.

[stuartcarnie]

LGTM