fix: add missing Event fields

[Thoralf-M]

Fixes #205

make bindings-example package_events
make[1]: Verzeichnis „/home/t/Desktop/iota-rust-sdk“ wird betreten

Running Go example "package_events"
Type:  0xb9d617f24c84826bf660a2f4031951678cc80c264aebc4413459fb2a95ada9ba::registry::NameRecordAddedEvent
Sender:  0x0000a4984bd495d4346fa208ddff4f5d5e5ad48c21dec631ddebc99809f16900
Module:  payment
JSON:  {"name":{"labels":["iota","name"]},"name_record":{"data":{"contents":[]},"expiration_timestamp_ms":"1783692571549","nft_id":"0x422e07698806aad526cf983e574f9f013b4a14a6ea6e51604f53d1f6e7debf10","target_address":null}}