Infer generic arguments of result builder attributes

[calda]

This PR adds a proposal to support inferring generic arguments of result builder attributes.

• Implementation: Add support for inferring generic arguments of result builder attributes swift#86209
• Swift Evolution pitch: https://forums.swift.org/t/add-arraybuilder-to-the-standard-library/83811

For example, this sample code is currently rejected with the error "reference to generic type 'ArrayBuilder' requires arguments in <...>", but would compile successfully by inferring it as ArrayBuilder<String>.

@resultBuilder
struct ArrayBuilder<Element> {
  static func buildBlock(_ elements: Element...) -> [Element] {
    elements
  }
}

@ArrayBuilder
var stringArray: [String] {
  "foo"
  "bar"
}