Add types for rack v3.2 and rack-session v2.1

gems/rack-session/.rubocop.yml

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+# This configuration inherits from /.rubocop.yml.
+# You can configure RBS style of this gem.
+# This file is used on CI. It is configured to automatically
+# make rubocop suggestions on pull requests for this gem.
+# If you do not like the style enforcement, you should remove this file.
+inherit_from: ../../.rubocop.yml
+
+##
+# If you want to customize the style, please consult with the gem reviewers.
+# You can see the list of cops at https://github.com/ksss/rubocop-on-rbs/blob/main/docs/modules/ROOT/pages/cops.adoc
+
+RBS/Layout:
+  Enabled: true
+
+RBS/Lint:
+  Enabled: true
+
+RBS/Style:
+  Enabled: true

gems/rack-session/2.1/_test/test.rb

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+require "rack"
+require "rack/session"
+
+secret = "x" * 64
+
+app = Rack::Builder.new do
+  use Rack::Session::Cookie, secrets: [secret], key: "_app_session", same_site: :lax, expire_after: 3600
+  run do |env|
+    session = env[Rack::RACK_SESSION] #: Rack::Session::Abstract::SessionHash
+    session["count"] = 1
+    session[:user_id] = 1
+    session.fetch("user_id", nil)
+    session.key?(:user_id)
+    session.delete("count")
+    session.to_hash.keys.first&.length
+    session.options[:skip] = true
+    [200, { "content-type" => "text/plain" }, ["ok"]]
+  end
+end
+
+Rack::Session::Pool.new(app.to_app, expire_after: 3600).pool.size
+Rack::Session::Cookie.new(app.to_app, coder: Rack::Session::Cookie::Base64::JSON.new, let_coder_handle_secure_encoding: true).coder
+
+encryptor = Rack::Session::Encryptor.new(secret)
+data = encryptor.encrypt({ "user_id" => 1 })
+data.length
+encryptor.decrypt(data)
+
+begin
+  encryptor.decrypt("invalid")
+rescue Rack::Session::Encryptor::Error => e
+  e.message
+end
+
+Rack::Session::SessionId.new("abc").private_id.length
+
+class MyStore < Rack::Session::Abstract::PersistedSecure
+  private
+
+  def find_session(req, sid)
+    [sid || generate_sid, {}]
+  end
+
+  def write_session(req, sid, session, options)
+    sid
+  end
+
+  def delete_session(req, sid, options)
+    generate_sid
+  end
+end

gems/rack-session/2.1/_test/test.rbs

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+class MyStore < Rack::Session::Abstract::PersistedSecure
+end