Change Return type of FieldNamingStrategy.translateName from String to List<String> for alternate. Ex. case insensitive.

To serialize/Deserialize case insensitive fieldnames,

I use annotation SerializedName like..

`@SerializedName(value="fieldName",alternate={"fieldname","FIELDNAME"})`

But too many @SerializedName .... I don't wanna check typo any more.

Just all i want is to case insensitive FieldNamingPolicy.. but.. no implementations..

So, reviewed some gson source, and I found ReflectiveTypeAdapterFactory is adding alternate...

but by FieldNamingStragy, just one fieldname is added to BoundField.

If FieldNamingStrategy.translateName returns List, and TypeAdapterFactory support it.

I can add case insensitive FieldNamePolicy for my own. :)

Or how about add case insensitive options?

Case insensitive fieldname policy is bad ideas? :(

Some json parser has restricted naming policy, i'ts hard to make multiple language RESTful API SDK.