Add HTTP multi-method routes API

[ChiragAgg5k]

What does this PR do?

Adds Http::routes() to the HTTP package so one route handler can be registered for multiple HTTP methods:

Http::routes([Http::REQUEST_METHOD_GET, Http::REQUEST_METHOD_POST], '/oauth/userinfo')
    ->action(...);

This supports endpoints such as OpenID Connect UserInfo, where the same endpoint must accept both GET and POST, without duplicating route actions or adding another alias-specific public API.

Implementation

• Adds Http::routes(string|array $methods, string $url): Route.
• Keeps Http::get(), post(), put(), patch(), and delete() as single-method wrappers around routes().
• Stores route methods as one ordered array on Route; the first method remains available through deprecated Route::getMethod() for backwards compatibility.
• Adds Route::getMethods() for route metadata.
• Registers every method in the router under the same path template and Route instance.
• Preserves path alias behavior so Http::routes([GET, POST], '/new')->alias('/old') matches both methods under both paths.
• Pre-validates method support, method path conflicts, and alias path conflicts before writing to the route table, preventing partial registrations when an exception is thrown.

Test plan

• bin/monorepo check http
• bin/monorepo test http