Add curl/swoole adapters

[abnegate]

Summary by CodeRabbit

• New Features
  • Pluggable HTTP adapters (cURL and Swoole) with streaming/chunk callbacks, redirects, per-host client caching, and rich request/adapter options.
• Bug Fixes
  • Improved JSON error reporting, safer text handling, and corrected binary/blob conversion.
• Refactor
  • Client switched to adapter-based architecture, enabled strict typing, and reduced default connect timeout.
• Tests
  • Expanded adapter and client tests for requests, redirects, streaming, timeouts, headers, query params, and file uploads.
• Chores
  • Added Docker, docker-compose, CI workflow updates, PHPStan tuning, .gitignore update, and a Swoole dev dependency.

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