ARROW-5233: [Go] Migrate to flatbuffers-v1.11.0

Needs #4161.

Author: Sebastien Binet <binet@cern.ch>

Closes #4228 from sbinet/issue-5233 and squashes the following commits:

323540c <Sebastien Binet> go/arrow/ipc: adapt to new flabuffers-v1.11
e82c908 <Sebastien Binet> go/arrow/ipc/feather: update format
bca7dda <Sebastien Binet> go/arrow/internal/flatbuf: update format
93c7c5e <Sebastien Binet> ARROW-5233:  Migrate to flatbuffers-v1.11.0

Author: sbinet

go/arrow/go.mod

@@ -18,7 +18,7 @@ module github.com/apache/arrow/go/arrow
 
 require (
 	github.com/davecgh/go-spew v1.1.0 // indirect
-	github.com/google/flatbuffers v1.10.0
+	github.com/google/flatbuffers v1.11.0
 	github.com/pkg/errors v0.8.1
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/stretchr/testify v1.2.0

go/arrow/go.sum

@@ -1,7 +1,7 @@
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/google/flatbuffers v1.10.0 h1:wHCM5N1xsJ3VwePcIpVqnmjAqRXlR44gv4hpGi+/LIw=
-github.com/google/flatbuffers v1.10.0/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
+github.com/google/flatbuffers v1.11.0 h1:O7CEyB8Cb3/DmtxODGtLHcEvpr81Jm5qLg/hsHnxA2A=
+github.com/google/flatbuffers v1.11.0/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=