Add support for AsyncHTTPClient

[mattt]

Resolves #9

[Copilot]

Pull request overview

Adds an AsyncHTTPClient-compatible integration for Replay by introducing a lightweight HTTPClientProtocol abstraction and a ReplayHTTPClient implementation that can replay from HAR/stubs and optionally passthrough/record via a live HTTPClient.

Changes:

• Introduce HTTPClientProtocol + ReplayHTTPClient (AsyncHTTPClient trait-gated) and conversion helpers between HTTPClientRequest/HAR/URLRequest.
• Extend PlaybackStore with recordEntry(_:) to support recording from non-URLSession clients.
• Add AsyncHTTPClient-focused documentation and CI/SwiftPM trait wiring (plus tests).

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
Sources/Replay/Replay+HTTPClient.swift	Adds HTTPClientProtocol, ReplayHTTPClient, and conversion/recording glue for AsyncHTTPClient.
Sources/Replay/Playback.swift	Exposes configuration internally and adds recordEntry(_:) for recording pre-built HAR entries.
Tests/ReplayTests/ReplayHTTPClientTests.swift	Adds tests for stub/entry replay and conversion helpers under canImport(AsyncHTTPClient).
README.md	Documents enabling the AsyncHTTPClient trait and using HTTPClientProtocol/ReplayHTTPClient.
Package.swift	Adds AsyncHTTPClient trait and conditional product dependency on AsyncHTTPClient.
Package.resolved	Locks new transitive dependencies from async-http-client.
.github/workflows/ci.yml	Updates CI build/test commands to enable the AsyncHTTPClient trait.

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