Feature request: Display JWT Header when decoding

[dv-shop]

Is your feature request related to a problem? Please describe. When decoding JWTs only the payload is displayed. To view the header and the signature I have to use other tools.

Describe the solution you'd like It would be great to see both the header and signatures block decoded in the CyberChef interface, or at least the header.

Describe alternatives you've considered N/A

Additional context N/A

[depperm]

for the header you can use From Base64

[co98357]

Added this in as an option for the user, waiting on pull request to be accepted.

https://github.com/gchq/CyberChef/pull/2050