GODRIVER-3832 Make ClientBulkWriteException implement ServerError

[FGasper]

GODRIVER-3832

(NB: I’ll happily add tests if there are no obvious problems with how I’ve implemented this.)

Summary

This makes ClientBulkWriteException implement ServerError. In particular, it fixes the bug where mongo.ErrorCodes returned an empty list from a ClientBulkWriteException.

Background & Motivation

Without making ClientBulkWriteException at least implement errorCoder, mongo.ErrorCodes() gives the wrong result with Client.BulkWrite.

Since it’s fairly straightforward, this changeset adds the additional controls needed for ClientBulkWriteException to implement ServerError.

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API Change Report

./v2/mongo

compatible changes

ClientBulkWriteException.ErrorCodes: added
ClientBulkWriteException.HasErrorCode: added
ClientBulkWriteException.HasErrorCodeWithMessage: added
ClientBulkWriteException.HasErrorLabel: added
ClientBulkWriteException.HasErrorMessage: added
ClientBulkWriteException.Labels: added

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🧪 Performance Results

Commit SHA: ad2b57b

The following benchmark tests for version 69ebd36170575f00079b6124 had statistically significant changes (i.e., |z-score| > 1.96):

Benchmark	Measurement	% Change	Patch Value	Stable Region	H-Score	Z-Score
BenchmarkSingleFindOneByID	ops_per_second_min	-72.0140	349.7567	Avg: 1249.7566 Med: 1245.4750 Stdev: 175.5629	0.8959	-5.1264
BenchmarkBSONDeepDocumentEncoding	ops_per_second_min	-53.8718	1685.7607	Avg: 3654.5142 Med: 3635.9405 Stdev: 552.2253	0.8518	-3.5651
BenchmarkBSONFullDocumentEncoding	ops_per_second_max	2.8666	49217.4427	Avg: 47845.8864 Med: 47766.8975 Stdev: 630.9402	0.7648	2.1738
BenchmarkBSONFlatDocumentDecoding	total_time_seconds	-1.9129	1.1765	Avg: 1.1994 Med: 1.1992 Stdev: 0.0063	0.8557	-3.6565

For a comprehensive view of all microbenchmark results for this PR's commit, please check out the Evergreen perf task for this patch.

[matthewdale]

The logic and change seem sound. ClientBulkWriteException is a server error, so it makes sense to make it implement the ServerError interface. @FGasper please add tests and we can get this merged! Thanks!