Address @glbrntt review comments; minor cleanups

Author: ktoso

Sources/AsyncHTTPClient/AsyncAwait/HTTPClient+tracing.swift

@@ -12,13 +12,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Logging
-import NIOCore
 import NIOHTTP1
 import Tracing
 
-import struct Foundation.URL
-
 @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
 extension HTTPClient {
     @inlinable

Sources/AsyncHTTPClient/AsyncAwait/Transaction.swift

@@ -35,23 +35,6 @@ final class Transaction:
 
     private let state: NIOLockedValueBox<StateMachine>
 
-    init(
-        request: HTTPClientRequest.Prepared,
-        requestOptions: RequestOptions,
-        logger: Logger,
-        connectionDeadline: NIODeadline,
-        preferredEventLoop: EventLoop,
-        span: (any Span)?,
-        responseContinuation: CheckedContinuation<HTTPClientResponse, Error>
-    ) {
-        self.request = request
-        self.requestOptions = requestOptions
-        self.logger = logger
-        self.connectionDeadline = connectionDeadline
-        self.preferredEventLoop = preferredEventLoop
-        self.state = NIOLockedValueBox(StateMachine(responseContinuation))
-    }
-
     init(
         request: HTTPClientRequest.Prepared,
         requestOptions: RequestOptions,