Eagerly cache global filters

Including a module can cause Ruby's global constant cache to be busted
if the included module contain constants. So that's something you don't
want to happen at "runtime", otherwise it will severely degrade performance
and if you are using YJIT or MJIT most of the compiled code will be invalidated.

To limit the impact of this, we can pre-include the global filters,
as they're generally registered during boot, that limits the problem
to non-global filters.

test/unit/strainer_template_unit_test.rb

@@ -57,8 +57,8 @@ class StrainerTemplateUnitTest < Minitest::Test
   end
 
   def test_add_filter_does_not_raise_when_module_overrides_previously_registered_method
-    strainer = Context.new.strainer
     with_global_filter do
+      strainer = Context.new.strainer
       strainer.class.add_filter(PublicMethodOverrideFilter)
       assert(strainer.class.send(:filter_methods).include?('public_filter'))
     end