[Feature]: Add support for Turso

[Kazy]

Describe the feature

Turso is an edge SQLite database. We would like for Shuttle to be able to provision and connect to it, exposing a libsql-client::Client.

Currently Turso doesn't offer a way through their SDK to create a database. The first would then be to simply add a way to initiate a client through a macro annotation. We can then later on add a way to instantiate one.

Suggestion or Example of how the feature would be used

#[shuttle_runtime::main]
async fn main(
    #[shuttle_turso(addr = "...")] client: libsql_client::Client,
) -> shuttle_axum::ShuttleAxum { 
    ...
}

Duplicate declaration

• I have searched the issues and this feature has not been requested before.