Add types for activestorage v8.1

gems/activestorage/8.1/_test/test.rb

@@ -0,0 +1,41 @@
+class User < ActiveRecord::Base
+  has_one_attached :one_image
+  has_many_attached :many_image
+  has_one_attached :avatar do |attachable|
+    attachable.variant :thumb, resize_to_limit: [100, 100]
+  end
+  has_many_attached :photos do |attachable|
+    attachable.named_variants
+  end
+end
+
+user = User.new
+one = ActiveStorage::Attached::One.new("one_image", user)
+one.url
+ActiveStorage::Blob.new.signed_id(purpose: :download).size
+
+blob = ActiveStorage::Blob.new
+blob.content_type&.start_with?("image/")
+blob.byte_size + 1
+blob.checksum&.size
+blob.metadata["width"]
+blob.service_name.to_sym
+blob.created_at.to_date
+attachment = ActiveStorage::Attachment.new
+attachment.name.to_sym
+attachment.blob.byte_size
+attachment.created_at.to_date
+
+blob.key.size
+blob.filename.extension.upcase
+blob.filename.base.upcase
+blob.filename.to_s.upcase
+blob.url(expires_in: 5.minutes).size
+blob.service_url_for_direct_upload.size
+blob.service_headers_for_direct_upload.each_value(&:size)
+blob.image? || blob.video?
+
+ActiveStorage::Variant.new(blob, { resize_to_limit: [100, 100] }).download
+ActiveStorage::Preview.new(blob, { resize_to_limit: [100, 100] }).download
+
+ActiveStorage::FixtureSet.generate_unique_secure_token(length: 28)

gems/activestorage/8.1/_test/test.rbs

@@ -0,0 +1,2 @@
+class User < ActiveRecord::Base
+end