feat: Add localeCookie option for middleware

[amannn]

Users have in various issues expressed the interest for customization of the locale cookie that the middleware sets. This PR adds such a capability via a new localeCookie option that can be configured via defineRouting:

import {defineRouting} from 'next-intl/routing';

export const routing = defineRouting({
  // ...
  localeCookie: {
    // Expire in 5 hours
    maxAge: 60 * 60 * 5
  }
});

… or turn the cookie off entirely:

import {defineRouting} from 'next-intl/routing';

export const routing = defineRouting({
  // ...
  localeCookie: false
});

See also: Proposed docs

---

Fixes #454
Fixes #1268

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