Commits on Mar 10, 2020

1. store: Optimized labels conversion on store.Series; Added unsafe labe… …

   …ls conversion.
   
   ## Changes
   
   * method TranslateLables CPU Optimized (streamed sorting).
   * All store GW label conversation to []storepb.Label are now alloc-less.
   
   ```
   go test -bench=BenchmarkUnsafeVSSafeLabelsConversion -run=^$ -benchmem -timeout 2h -benchtime 10s ./pkg/store/storepb/...
    goos: linux
    goarch: amd64
    pkg: github.com/thanos-io/thanos/pkg/store/storepb
    BenchmarkUnsafeVSSafeLabelsConversion/safe-12         	   34822	    339076 ns/op	  655368 B/op	       2 allocs/op
    BenchmarkUnsafeVSSafeLabelsConversion/unsafe-12       	1000000000	         2.32 ns/op	       0 B/op	       0 allocs/op
   PASS
   ```
   
   TODO: Do the same on Querier.
   
   Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>

   

   bwplotka committed Mar 10, 2020
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