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ARROW-5108: [Go] implement reading primitive arrays from Arrow file

This CL adds the generation of flatbuffers-based files for the IPC backend.
This CL adds the basic functionality to read an Arrow file.

Author: Sebastien Binet <binet@cern.ch>

Closes #4114 from sbinet/issue-5108 and squashes the following commits:

ede1b345 <Sebastien Binet> arrow/ipc: address comment about double (de)serializing
200a01ad <Sebastien Binet> arrow/ipc/cmd/arrow-{cat,ls}: refactor to ease testing
f523d065 <Sebastien Binet> arrow/ipc: store bitwidth
ee6ab29a <Sebastien Binet> arrow/ipc: implement PR reviews for NewMessage
b87c051f <Sebastien Binet> arrow/ipc: implement PR reviews
00f70e0a <Sebastien Binet> arrow/ipc: prepare for file writer and stream writer
ea7efa79 <Sebastien Binet> arrow/ipc: cosmetics
92aa9684 <Sebastien Binet> ci: disable -race on windows
fa979e7f <Sebastien Binet> arrow/ipc/cmd/arrow-cat: detect stream/file and be resilient
0e7392ca <Sebastien Binet> ci: fixups for Go commands
7891d45c <Sebastien Binet> arrow/ipc/cmd/arrow-{cat,ls}: first import
e28f7105 <Sebastien Binet> arrow/ipc: impl read streamer
55f32510 <Sebastien Binet> arrow/ipc: first stabs at Reader
5380ee56 <Sebastien Binet> arrow/ipc: more dictMemo tests
0b2ed485 <Sebastien Binet> arrow/ipc: add more dictMemo tests
d9ea22a6 <Sebastien Binet> arrow/array: test Boolean.Stringer
4dfcd784 <Sebastien Binet> arrow/internal/bitutil: add tests for IsMultipleOf8
011f7c65 <Sebastien Binet> arrow/ipc: rename Message.ref into refCount
080fb239 <Sebastien Binet> go.mod
40a9927c <Sebastien Binet> go.sum: temporarily disable go.sum for flatbuffers
1f4cf5c8 <Sebastien Binet> ARROW-5108:  implement reading primitive arrays from Arrow file