Use RawMessage when checking if tag value is json (#1421)
Use RawMessage when checking if tag value is json (#1421)

It should be considerably faster than unmarshal to `map[string]interface{}`

Signed-off-by: yura <55f88b80503504c2367474da68e9f3e5484efd72@gmail.com>
jpkrohling/jaeger,jpkrohling/jaeger,pavolloffay/jaeger,jaegertracing/jaeger,jaegertracing/jaeger,jaegertracing/jaeger,pavolloffay/jaeger,uber/jaeger,pavolloffay/jaeger,pavolloffay/jaeger,jaegertracing/jaeger,jpkrohling/jaeger,jaegertracing/jaeger,uber/jaeger,jpkrohling/jaeger,uber/jaeger,jpkrohling/jaeger,uber/jaeger,pavolloffay/jaeger