fix: Make query-side AnnotatedQuery forwarders Send-clean

[chmodas]

The fetch_*/execute methods on AnnotatedQuery were declared as async fn, which generated a coroutine state machine on this crate's side. Inside that coroutine, rustc's auto-trait Send inference had to discharge the HRTB for<'a> &'a mut DB::Connection: sqlx::Executor<'a, ...> carried by the IntoAnnotatedExecutor impls – and could not, breaking query-side annotation inside tokio::spawn, axum handlers, and tower::Service-bounded futures.

Convert the five forwarders (fetch_optional, fetch_all, fetch_one, execute, execute_many) from async fn -> T to `fn -> impl Future<Output = T> + Send

• 'e. The body forwards sqlx's underlying future directly with no .await`, so no coroutine forms at this layer; Send delegates to sqlx's own already-Send future. The HRTB on the IntoAnnotatedExecutor impls and on impl_executor! is unchanged, and the executor-side surface is unaffected.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.90%. Comparing base (cc812e5) to head (7fb8306).
⚠️ Report is 1 commits behind head on trunk.
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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk      #31   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files          12       12           
  Lines        2030     2034    +4     
=======================================
+ Hits         2028     2032    +4     
  Misses          2        2           

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