feat(client): allow overriding of Accept header per request

[manchenkoff]

Is your PR related to a specific issue/feature? Please describe and mention issues.

Allows users to override Accept header value for custom scenarios, when non-JSON response is expected.

For example, when using StreamResponse in Laravel

final class QuoteController extends Controller
{
    public function __invoke(Request $request): JsonResponse|StreamedResponse
    {
        /** @var string $quote */
        $quote = Inspiring::quotes()->random();
        [$text, $author] = explode(' - ', $quote);

        if ($request->header('Accept') === 'text/event-stream') {
            return response()->eventStream(
                function () use ($text, $author) {
                    yield $text;
                }
            );
        }

        $data = [
            'text' => $text,
            'author' => $author,
        ];

        return response()->json($data);
    }
}

In this case, in the Nuxt application we can make a request by using useSanctumClient like this:

const sanctumFetch = useSanctumClient()
const response = await sanctumFetch<ReadableStream, 'stream'>(
    '/api/quote',
    {
        headers: {
            Accept: 'text/event-stream',
        },
        responseType: 'stream',
    },
)

const reader = response.pipeThrough(new TextDecoderStream()).getReader()

while (true) {
    const { value, done } = await reader.read()

    if (done)
        break

    console.log('Received:', value)
}