Change `.tailor`'s type definition to return `this`.

### Runtime

node.js

### Runtime version

18.20.4

### Module version

17.13.3

### Used with

hapi application

### Any other relevant information

_No response_

### What problem are you trying to solve?

The `.tailor` call's type definition return `Schema` and loses the actual schema type it was called on. It likely should return `this`.

### Do you have a new or modified API suggestion to solve the problem?

Have `.tailor` return `this` in the `index.d.ts`.