feat(model): Introduce poro model plugin

This model plugin would be used in serializers for PORO.
It's implementation is empty but it works as expected.
See spec/app/app/serializers/alba/poro_serializer.rb for details.

lib/typelizer.rb

@@ -16,6 +16,7 @@
 require_relative "typelizer/serializer_plugins/ams"
 
 require_relative "typelizer/model_plugins/active_record"
+require_relative "typelizer/model_plugins/poro"
 
 require_relative "typelizer/railtie" if defined?(Rails)
 

lib/typelizer/model_plugins/poro.rb

@@ -0,0 +1,13 @@
+module Typelizer
+  module ModelPlugins
+    class Poro
+      # We don't care about intialization
+      def initialize(...)
+      end
+
+      def infer_types(prop)
+        prop
+      end
+    end
+  end
+end

spec/__snapshots__/AlbaPoro.ts.snap

@@ -0,0 +1,10 @@
+// Typelizer digest 3c3acd1390157d9666f0f2be46bfcb1c
+//
+// DO NOT MODIFY: This file was automatically generated by Typelizer.
+
+type AlbaPoro = {
+  foo: unknown;
+  bar: string | null;
+}
+
+export default AlbaPoro;

spec/__snapshots__/index.ts.snap

@@ -1,9 +1,10 @@
-// Typelizer digest 57b8f7cafc55a420da0bed2b12cadf83
+// Typelizer digest b11065c38d475f7104b4d09c6ee44a31
 //
 // DO NOT MODIFY: This file was automatically generated by Typelizer.
 export type { default as AlbaInline } from './AlbaInline'
 export type { default as AlbaMetaNil } from './AlbaMetaNil'
 export type { default as AlbaMeta } from './AlbaMeta'
+export type { default as AlbaPoro } from './AlbaPoro'
 export type { default as AlbaPost } from './AlbaPost'
 export type { default as AlbaUserAuthor } from './AlbaUserAuthor'
 export type { default as AlbaUser } from './AlbaUser'

spec/app/app/models/poro.rb

@@ -0,0 +1,9 @@
+class Poro
+  def foo
+    "This is foo method"
+  end
+
+  def as_json
+    {foo: foo}
+  end
+end

spec/app/app/serializers/alba/poro_serializer.rb

@@ -0,0 +1,15 @@
+module Alba
+  class PoroSerializer
+    include Alba::Serializer
+    include Typelizer::DSL
+
+    typelize_from :poro
+
+    typelizer_config do |c|
+      # This is required
+      c.model_plugin = Typelizer::ModelPlugins::Poro
+    end
+
+    attributes :foo, bar: :String
+  end
+end