Enable readability-identifier-naming in clang-tidy

[PragmaTwice]

We enable readability-identifier-naming in clang-tidy to check naming convension.

Rules:

  - key:           readability-identifier-naming.LocalVariableCase
    value:         lower_case
  - key:           readability-identifier-naming.StructCase
    value:         CamelCase
  - key:           readability-identifier-naming.ClassCase
    value:         CamelCase
  - key:           readability-identifier-naming.UnionCase
    value:         CamelCase
  - key:           readability-identifier-naming.ParameterCase
    value:         lower_case
  # FIXME: enable these options
  # - key:           readability-identifier-naming.PublicMethodCase
  #   value:         CamelCase
  # - key:           readability-identifier-naming.PrivateMethodCase
  #   value:         camelBack
  # - key:           readability-identifier-naming.ProtectedMethodCase
  #   value:         camelBack
  - key:           readability-identifier-naming.LocalConstantCase
    value:         aNy_CasE  # FIXME: use a more strictly case
  - key:           readability-identifier-naming.ClassMemberCase
    value:         lower_case
  - key:           readability-identifier-naming.ClassMemberSuffix
    value:         _
  - key:           readability-identifier-naming.ClassConstantCase
    value:         aNy_CasE  # FIXME: use a more strictly case