Create template transaction

### Is your feature request related to a problem?

Actually when we create a transaction we need to create it from scratch each time.
But we often want to create multiple transaction that are often the same (testing smart contract for ex.)

### Describe the solution you'd like

It could be interesting to store somewhere some template of a transaction that we can load into the TUI to prefill the fields and then we can just update what we want.
This template could also be sent as this without using the TUI but directly from the CLI

### Additional context

_No response_

Start by reading the existing transaction-creation flow in the TUI and the corresponding CLI entry point. Define how transaction templates are stored, loaded to prefill TUI fields, updated, and sent directly through the CLI; done means both reuse paths work without recreating transactions from scratch.

Written by the indexing model from the issue text.