Allow specifying custom parameters

The library locks you into providing only specific parameters. For example, `\Api\CurrentUser`:

The `/user/repos` endpoint has more parameters than just these, though, such as `per_page`, which is now being locked to 30 because users cannot specify a custom value.

If there *is* however a way to specify custom options without having to do any hacky things with `$client->getHttpClient`, I'd love to hear.

Start by examining Api\CurrentUser and how requests to /user/repos accept and pass parameters; the issue specifically mentions the client’s getHttpClient as a possible workaround. Determine how custom options such as per_page should be exposed, then verify that callers can override the current fixed value without relying on the underlying HTTP client.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.