ARROW-5110: [Go] implement reading struct arrays from Arrow file

[sbinet]

No description provided.

[sbinet]

needs #4157

[codecov-io]

Codecov Report

Merging #4158 into master will decrease coverage by 26.75%.
The diff coverage is 4.61%.

@@ Coverage Diff @@## master #4158 +/- ##
===========================================
- Coverage 87.89% 61.13% -26.76% 
===========================================
Files 758 67 -691 Lines 92163 4912 -87251 Branches 1251 0 -1251 ===========================================
- Hits 81006 3003 -78003 + Misses 11040 1798 -9242 + Partials 117 111 -6

Impacted Files	Coverage Δ
go/arrow/ipc/file_reader.go	0% <0%> (ø)	⬆️
go/arrow/ipc/metadata.go	0% <0%> (ø)	⬆️
go/arrow/array/list.go	74.56% <0%> (-12.18%)	⬇️
go/arrow/array/struct.go	84.31% <100%> (+11.67%)	⬆️
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
... and 687 more

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[sbinet]

PTAL @stuartcarnie@alexandreyc@nickpoorman

[stuartcarnie]

LGTM 👍