Refactor the `mrb_get_args()` function

- Removed the `ARGV` macro.
  The current path doesn't go into the mruby VM and there's also no need to separate variables.
- Use common functions to check object types.
  - Use `mrb_ensure_string_type()` to check the string instead of `mrb_to_str()`.
    This is for consistency with array and hash.
  - Use `mrb_ensure_array_type()` to check the array instead of `to_ary()`.
  - Use `mrb_ensure_hash_type()` to check the hash instead of `to_hash()`.
  - Add and use `ensure_class_type()` to check class and module.
- Changed the argument index type from `mrb_int` to `int`.
  Even if it is `int16_t`, it is enough.
  `mrb_int` is overkill, especially if `MRB_32BIT` and `MRB_INT64` are defined.

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