feat: Support ./i18n/request.ts in addition to i18n.ts

[amannn]

There are typically at least two config files you're using when choosing the i18n routing setup:

• ./src/i18n.ts
• ./src/routing.ts

i18n.ts is currently named in a rather generic way, almost indicating that it contains everything related to i18n.

In order to clarify the meaning of these files and to gather them in a shared place, this PR proposes a new default location for the request config as well as the routing config:

└── src
    └── i18n
        ├── request.ts
        └── routing.ts

From my experience, many people already use an i18n folder or similar. This change might come in handy and avoids a potential configuration step for users.

That being said, i18n.ts is still supported, so there's no need to change existing apps.

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