Move anonymous class/module detection from indexer to resolver

[Morriar]

Currently, handle_dynamic_class_or_module() in the indexer detects Class.new and Module.new calls by checking if the receiver name is Class or Module. However, this check happens before name resolution, so it can't distinguish between top-level ::Class/::Module and redefined constants with the same name.

Consider this example:

module Foo
  class Module; end
  class Class; end

  Module.new  # This is Foo::Module.new, NOT anonymous module creation
  Class.new   # This is Foo::Class.new, NOT anonymous class creation
end

Here, Foo::Module and Foo::Class are regular classes that shadow the top-level Module and Class. Calling .new on them should be treated as ordinary method calls, not as anonymous class/module definitions. But because the indexer only sees the unresolved name Module/Class, it incorrectly treats these as anonymous class/module creation.

The fix would be to move the anonymous class/module detection logic to the resolver pass, where constant resolution is available and we can determine whether Class/Module actually refers to ::Class/::Module.