✨ Zap: Add JSONEncoder and ConsoleEncoder opts

Currently, setting the encoding is pretty annoying and requires to
import two more packages apart from log/zap:

```
encoderConfig := uberzap.NewProductionEncoderConfig()
zap.New(zap.Encoder(zapcore.NewJSONEncoder(encoderConfig))
```

This PR adds a JSONEncoder and ConsoleEncoder opt to simplify this

pkg/log/zap/zap.go

@@ -71,6 +71,13 @@ func Encoder(encoder zapcore.Encoder) func(o *Options) {
 	}
 }
 
+// JSONEncoder configures the logger to use a JSON Encoder
+func JSONEncoder(opts ...EncoderConfigOption) func(o *Options) {
+	return func(o *Options) {
+		o.Encoder = newJSONEncoder(opts...)
+	}
+}
+
 func newJSONEncoder(opts ...EncoderConfigOption) zapcore.Encoder {
 	encoderConfig := zap.NewProductionEncoderConfig()
 	for _, opt := range opts {
@@ -79,6 +86,13 @@ func newJSONEncoder(opts ...EncoderConfigOption) zapcore.Encoder {
 	return zapcore.NewJSONEncoder(encoderConfig)
 }
 
+// ConsoleEncoder configures the logger to use a Console encoder
+func ConsoleEncoder(opts ...EncoderConfigOption) func(o *Options) {
+	return func(o *Options) {
+		o.Encoder = newConsoleEncoder(opts...)
+	}
+}
+
 func newConsoleEncoder(opts ...EncoderConfigOption) zapcore.Encoder {
 	encoderConfig := zap.NewDevelopmentEncoderConfig()
 	for _, opt := range opts {