Generate builders for structures

[keynmol]

Perhaps it will make IDE experience better if structures exposed builder-style pattern.

I.e. if you have a SymbolInformation structure:

case class SymbolInformation(
  deprecated: Opt[Boolean] = Opt.empty,
  location: structures.Location,
  name: String,
  kind: enumerations.SymbolKind,
  tags: Opt[Vector[enumerations.SymbolTag]] = Opt.empty,
  containerName: Opt[String] = Opt.empty
)

It has 3 required fields (location, name, kind) and several optional fields. All the fields become withCamelCase methods on the generated builder, but to create the builder you need to pass the required fields:

SymbolInformation
  .builder(name, location, kind)
  .withTags(v: Vector[SymbolTag])
  .withContainerName(s: String)
  .withName(s: String) // overwrites the value passed to the builder method
  .build // : SymbolInformation