uber-go / zap / 1665

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zaptest/observer: Support filtering by message or field (#386)

* zaptest/observer: Support filtering by message or field

Add `Filter*` functions to filter a set of ObservedLogs and return
a new set of ObservedLogs. This allows chaining of multiple filters
such as `sink.FilterMessage(..).FilterField(..)` for easier use in
tests.

* Handle duplicate fields

21 of 21 new or added lines in 1 file covered. (100.0%)

2251 of 2324 relevant lines covered (96.86%)

73023.39 hits per line