feat(jwt): support for getting payload from c.get('jwtPayload')

[yusukebe]

Copied from #1013.

---

This PR will add support for getting the decoded payload from c.get('jwtPaload') for JWT Auth Middleware.

app.post(
  '/auth/abc',
  jwt({
    secret: 'a-secret',
  }),
  (c) => {
    const payload = c.get('jwtPayload')
    //...
  }
)

This will resolve #810 #1005

Does it include breaking changes?

The verify() API in utils/jwt/jwt.ts has been changed. It will return any instead of boolean. This seems to be a breaking change, but this function is mainly "utility" used in the Hono internal. We should release the fix, including breaking changes as major version up, but this change will not affect end users. EDIT I'd like to release it as a minor version up "3.2.0".

EDIT:

We can release this with a patch release.

• Utilities such as utils/url.ts are broken and changed without notice. utilities are intended to be used internally and may be changed in patch releases. Same for `utils/jwt/jwt.ts.
• It is not a major feature addition, and we don't have to include it in the Minor or Major release.