ARROW-6545: [Go] update IPC writer to use two-part EOS
ARROW-6545: [Go] update IPC writer to use two-part EOS

Closes #5363 from sbinet/issue-6545 and squashes the following commits:

804ea87f8 <Sebastien Binet> ARROW-6545:  update IPC writer to use two-part EOS

Authored-by: Sebastien Binet <be0c0d1298e63814a95fcb7523d1ca1345b4ca1f@cern.ch>
Signed-off-by: Wes McKinney <3be70eed0275ec2606f002bff3514252e145d204@apache.org>

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