Support detailed_message for DuplicatedMethodDefinitionError, DuplicatedInterfaceMethodDefinitionError, UnknownMethodAliasError and InvalidOverloadMethodError

[ksss]

I also added support to #detailed_message for following errors.

DuplicatedMethodDefinitionError

a.rbs:2:2...2:21: ::Foo#foo has duplicated definitions in a.rbs:3:2...3:21 (RBS::DuplicatedMethodDefinitionError)

  def foo: () -> String
  ^^^^^^^^^^^^^^^^^^^^^

DuplicatedInterfaceMethodDefinitionError

a.rbs:9:2...9:14: Duplicated method definition: ::Hello#foo (RBS::DuplicatedInterfaceMethodDefinitionError)

  include _I2
  ^^^^^^^^^^^

UnknownMethodAliasError

a.rbs:2:2...2:15: Unknown method alias name: yyy => xxx (::Error) (RBS::UnknownMethodAliasError)

  alias self.xxx self.yyy
  ^^^^^^^^^^^^^^^^^^^^^^^

InvalidOverloadMethodError

a.rbs:2:2...2:36: Invalid method overloading: ::Hello#foo (RBS::InvalidOverloadMethodError)

  def foo: (Integer) -> String | ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ref: #1280
ref: #1166

[soutaro]

🎉