Give users ability to do transact

[dudo50]

Give user ability to do transact:

Builder().from().to().currency().transact("instructions to execute on destination in hex")

Example: https://github.com/shawntabrizi/polkadot-sdk-workshop-xcm/blob/833c50c3213f78687086bce0ec0bfc21343c623f/execution/src/tests/full.rs#L230

https://docs.polkadot.com/develop/interoperability/xcm-guides/from-apps/transfers/#origin-preservation