relay transfer
in https://github.com/monero-ecosystem/monero-python/blob/3f3a4cdc2a92a088172266d1916fbf2f59c23f2d/monero/backends/jsonrpc/wallet.py#L313 I think passing `relay=True`  to the  transfer method should set `get_tx_metadata` to the same value as `do_not_relay` so that one is able to use it afterwards and relay the transaction.

also I noticed that while unlock_time is configurable and default to 0 it is hardcoded in the data dict pass down, see
https://github.com/monero-ecosystem/monero-python/blob/3f3a4cdc2a92a088172266d1916fbf2f59c23f2d/monero/backends/jsonrpc/wallet.py#L309