[WIP] [OpenAPI]: Blueprint inheritance

[Abishekcs]

closes #290

What this PR does?

Add support for blueprint inheritance. Child blueprints now inherit fields from parent blueprints. A child re-declaring a field with a different name: takes priority over the parent's declaration.

Example Code

• data_mining_base.rb

class DataMiningBase < Blueprinter::Base
  field :hello_world
  field :email
end

• data_mining.rb

class DataMining < DataMiningBase
  identifier :uuid
  field :email, name: :login
  field :first_name

• OpenAPI response output for # @response DataMining

{
  "hello_world": "string",
  "uuid": "string",
  "login": "string",
  "first_name": "string"
}

ScreenRecording

• Before

• After