migrate from gogo/protobuf

[mxmCherry]

• vendored trimmed down gogo/protobuf/io (as internal/pbio)
• switched to golang/protobuf

[mxmCherry]

@dim just in case: ext/parquet test fails for me:

• Failure [0.001 seconds]
Decoder
/home/mxmcherry/src/bsm/feedx/ext/parquet/decoder_test.go:16
  should decode [It]
  /home/mxmcherry/src/bsm/feedx/ext/parquet/decoder_test.go:37

  Expected
      <*parquet_test.mockStruct | 0xc00022a000>: {
          ID: 4,
          Bool: true,
          TinyInt: 0,
          SmallUint: 0,
          StdInt: 0,
          BigInt: 0,
          Float: 0,
          Double: 0,
          DateString: "03/01/09",
          ByteString: "0",
          Timestamp: 2009-03-01T02:00:00+02:00,
      }
  to equal
      <*parquet_test.mockStruct | 0xc00022aa10>: {
          ID: 4,
          Bool: true,
          TinyInt: 0,
          SmallUint: 0,
          StdInt: 0,
          BigInt: 0,
          Float: 0,
          Double: 0,
          DateString: "03/01/09",
          ByteString: "0",
          Timestamp: 2009-03-01T00:00:00+02:00,
      }

  /home/mxmcherry/src/bsm/feedx/ext/parquet/decoder_test.go:40

That's something to do with my +02:00 timezone; maybe expected value should be changed from time.Date(..., time.Local) to time.Unix(...)?

[mxmCherry]

@dim pushed both official protobuf + gogo protobuf handling (though no tests for gogo - maybe worth doing?)

[dim]

Will take a look at tests, 1s

[dim]

That's something to do with my +02:00 timezone; maybe expected value should be changed from time.Date(..., time.Local) to time.Unix(...)?

Hmm, yeah, timestamps in parquet should include TZ information, let me check and confirm, 1s

[dim]

Fix tests, then 👍

[mxmCherry]

@dim fixed, you can merge now (I cannot)

[mxmCherry]

@dim and release, please (0.12.3 - no breaking changes)