Add an rbs for TypeProf namespace

scenario/class/unknown-cbase.rb

@@ -0,0 +1,37 @@
+## update: test.rb
+class Foo::Bar
+  class C
+    def foo
+      1
+    end
+  end
+end
+
+# Currently, Foo::Bar::C cannot be resolved because there is no definition of Foo
+class D < Foo::Bar::C
+  def check = foo
+end
+
+## assert: test.rb
+class Foo::Bar
+  class Foo::Bar::C
+    def foo: -> Integer
+  end
+end
+class D # failed to identify its superclass
+  def check: -> untyped
+end
+
+## update: test.rbs
+module Foo
+end
+
+## assert: test.rb
+class Foo::Bar
+  class Foo::Bar::C
+    def foo: -> Integer
+  end
+end
+class D < Foo::Bar::C
+  def check: -> Integer
+end

sig/typeprof.rbs

@@ -0,0 +1,2 @@
+module TypeProf
+end