Use @Path parameter name as default value

[Foso]

Is your feature request related to a problem? Please describe.
The Path annotation always needs a value which in some cases might be the same as the parameter name.
@GET("posts/{postId}") suspend fun getPostById(@Path("postId") postId: Int = 4): Post

Describe the solution you'd like
We can improve this by setting a defaultValue for value. When the default is not changed, the parameter name will be used as the value. When the default is changed, that value will be used. Everything else stays the same

@GET("posts/{postId}") suspend fun getPostById(@Path postId: Int = 4): Post