feat: Add support for IOTA-Names

[DaughterOfMars]

Descriptions

Adds three graphql queries and types to support IOTA-Names.

[Thoralf-M]

Default name: name.iota 🎉

from lib.iota_sdk_ffi import *

import asyncio


async def main():
    client = GraphQlClient.new_devnet()
    
    name = await client.iota_names_default_name(Address.from_hex("0x0000a4984bd495d4346fa208ddff4f5d5e5ad48c21dec631ddebc99809f16900"), None)
    print("Default name:", name.format(NameFormat.DOT))

if __name__ == "__main__":
    asyncio.run(main())

[Alex6323]

tbh this error is a bit confusing since we actually have two separators and it's not clear that this error and its message make only sense for the @ separator.

Can we be more explicit here?

[DaughterOfMars]

sure, done