🏗️ [Core Feature]: impl ToAuthor for `evm-template` and configure in `Trader`

[4meta5]

templates

• [ ] Generic Runtime Template
• [X] Evm Template

What is the key feature we're aiming to implement?

impl ToAuthor for evm-template so Trader config matches that of generic-template

Note that polkadot_runtime_common::impl::ToAuthor does not work because it assumes AccountId32

Contribution Guidelines

• [X] I agree to follow this project's Contribution Guidelines