feat: add decodeUsing method in Response of http client

[albertcht]

This PR adds a new decodeUsing function to extend response decoding capabilities. It allows developers to support decoding methods other than JSON.

[Copilot]

Pull request overview

This PR adds a decodeUsing method to the HTTP client's Response class, enabling developers to provide custom decoding logic as an alternative to the default JSON decoding. This allows handling of non-JSON response formats such as pipe-delimited, XML, or other custom formats.

Key Changes

• Added decodeUsing method to set custom decoder callbacks
• Refactored decoding logic into a centralized decode method
• Updated json() and object() methods to use the new decode mechanism

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
src/http-client/src/Response.php	Implements the decodeUsing method, adds $decodeUsing property, and refactors decoding logic into a new protected decode method
tests/HttpClient/HttpClientTest.php	Adds test case demonstrating custom decoder usage with a pipe-delimited format

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