Handle API Options Consistently

[kyleboe]

On the Nostrum.Api module, currently the options type is simply defined as a map | list.

This does not provide much context for which keys/values are specifically required/optional and how they are typed.

With the upcoming decomposition of Nostrum.Api into submodules, this may be an appropriate location to define more structured types for option arguments. Something like this:

@type guild_member_options :: %{
          nick: Guild.Member.nick(),
          roles: [Snowflake.t()],
          mute: boolean,
          deaf: boolean,
          channel_id: Snowflake.t(),
          communication_disabled_until: DateTime.t() | nil
        }