feat(container): add conditional bindings

[RomainLanz]

Hey! 👋🏻

This PR adds a new API to register conditional bindings.

Example Story: You want to try a new payment gateway and roll-out that feature only to a few users.

With the new API, you can register a conditional bindings that resolve a different class depending on a condition.

container.bind(PaymentGateway, (resolver) => {
  return resolver.make(StripePaymentGateway)
})

container.bindWhen(
  PaymentGateway,
  async (resolver) => {
    const ctx = await resolver.make(HttpContext)
    return ctx.auth.user?.featureFlags.includes('new-payment') === true
  },
  (resolver) => resolver.make(BetaPaymentGateway)
)