hertz-jwt , how to get token from request body?

[annie-jpg]

Is your feature request related to a problem? Please describe.
Yes, if the front-end uses the multipart/form-data method to send the token, I cannot use the four methods of hertz-jwt to obtain the token. Should we add the method to obtain the token from the request body?

A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
When i want to get token from request body...

Describe the solution you'd like
Add the method to obtain the token, except header, query, cookie and param.

Describe alternatives you've considered
none.

Additional context
none.

[li-jin-gou]

refer to hertz-contrib/jwt#14